diff --git a/code/apps/client/source/game.c b/code/apps/client/source/game.c
index e367b80..979ce86 100644
--- a/code/apps/client/source/game.c
+++ b/code/apps/client/source/game.c
@@ -86,7 +86,7 @@ void game_world_view_set_active_by_idx(uint16_t idx) {
     game_world_view_set_active(&world_viewers[idx]);
 }
 
-void game_world_view_active_entity_map(void (*map_proc)(uint64_t key, entity_view value)) {
+void game_world_view_active_entity_map(void (*map_proc)(uint64_t key, entity_view * value)) {
     entity_view_map(&active_viewer->entities, map_proc);
 }
 
@@ -154,6 +154,8 @@ void game_update() {
         network_client_tick();
     }
     else world_update();
+    
+    game_world_cleanup_entities();
 }
 
 void game_render() {
@@ -162,4 +164,20 @@ void game_render() {
 
 void game_action_send_keystate(float x, float y, uint8_t use, uint8_t sprint) {
     pkt_send_keystate_send(active_viewer->view_id, x, y, use, sprint);
+}
+
+void game_world_cleanup_entities(void) {
+    for (int i = 0; i < zpl_buffer_count(world_viewers); i += 1){
+        entity_view_tbl *view = &world_viewers[i].entities;
+        
+        for (int j = 0; j < zpl_array_count(view->entries); j += 1){
+            entity_view *e = &view->entries[j];
+            if (e->tran_effect == ETRAN_REMOVE) {
+                entity_view_tbl_remove(view, e->ent_id);
+                j--;
+            } 
+        }
+        
+    }
+    
 }
\ No newline at end of file
diff --git a/code/apps/client/source/main.c b/code/apps/client/source/main.c
index 6f16a3c..f87cd53 100644
--- a/code/apps/client/source/main.c
+++ b/code/apps/client/source/main.c
@@ -16,7 +16,7 @@
 #define DEFAULT_WORLD_SEED 302097
 #define DEFAULT_BLOCK_SIZE 16 /* amount of units within a block (single axis) */
 #define DEFAULT_CHUNK_SIZE 16 /* amount of blocks within a chunk (single axis) */
-#define DEFAULT_WORLD_SIZE 8 /* amount of chunks within a world (single axis) */
+#define DEFAULT_WORLD_SIZE 32 /* amount of chunks within a world (single axis) */
 
 int main(int argc, char** argv)
 {
@@ -50,7 +50,7 @@ int main(int argc, char** argv)
     uint16_t block_size = zpl_opts_integer(&opts, "block-size", DEFAULT_BLOCK_SIZE);
     uint16_t chunk_size = zpl_opts_integer(&opts, "chunk-size", DEFAULT_CHUNK_SIZE);
     uint16_t world_size = zpl_opts_integer(&opts, "world-size", DEFAULT_WORLD_SIZE);
-    uint32_t npc_count = zpl_opts_integer(&opts, "npc-count", 100);
+    uint32_t npc_count = zpl_opts_integer(&opts, "npc-count", 1000);
     
     if (zpl_opts_has_arg(&opts, "random-seed")) {
         zpl_random rnd={0};
diff --git a/code/apps/client/source/platform_raylib.c b/code/apps/client/source/platform_raylib.c
index 5b91ed2..2c1ba4d 100644
--- a/code/apps/client/source/platform_raylib.c
+++ b/code/apps/client/source/platform_raylib.c
@@ -129,15 +129,17 @@ void platform_input() {
 
 void display_conn_status();
 
-void DEBUG_draw_entities(uint64_t key, entity_view data);
-void DEBUG_draw_ground(uint64_t key, entity_view data);
+void DEBUG_draw_entities(uint64_t key, entity_view * data);
+void DEBUG_draw_ground(uint64_t key, entity_view * data);
 
-void lerp_entity_positions(uint64_t key, entity_view data);
+void lerp_entity_positions(uint64_t key, entity_view * data);
+void do_entity_fadeinout(uint64_t key, entity_view * data);
 
 float zpl_lerp(float,float,float);
 
 void platform_render() {
     game_world_view_active_entity_map(lerp_entity_positions);
+    game_world_view_active_entity_map(do_entity_fadeinout);
     render_camera.zoom = zpl_lerp(render_camera.zoom, target_zoom, 0.18);
     camera_update();
 
@@ -163,14 +165,13 @@ void display_conn_status() {
         }
     } else {
         DrawText("Connection: single-player", 5, 5, 12, BLUE);
-        //DrawText("Connection: ", 5, 5, 52, BLUE);
     }
     
     DrawFPS(0, 20);
 }
 
-void DEBUG_draw_ground(uint64_t key, entity_view data) {
-    switch (data.kind) {
+void DEBUG_draw_ground(uint64_t key, entity_view * data) {
+    switch (data->kind) {
         case EKIND_CHUNK: {
             world_view *view = game_world_view_get_active();
             int32_t size = view->chunk_size * view->block_size;
@@ -180,10 +181,10 @@ void DEBUG_draw_ground(uint64_t key, entity_view data) {
             float block_spacing = (float)block_size * (size/(float)(chunk_size*block_size));
             float block_offset = size - block_spacing*chunk_size;
             
-            double x = data.x * size + offset;
-            double y = data.y * size + offset;
-            DrawRectangleEco((int)x-offset, (int)y-offset, size+offset, size+offset, BLACK);
-            DrawRectangleEco((int)x, (int)y, size-offset, size-offset, LIME);
+            float x = data->x * size + offset;
+            float y = data->y * size + offset;
+            DrawRectangleEco(x-offset, y-offset, size+offset, size+offset, ColorAlpha(BLACK, data->tran_time));
+            DrawRectangleEco(x, y, size-offset, size-offset, ColorAlpha(LIME, data->tran_time));
             
 #if 0
             for (uint16_t i = 0; i < chunk_size*chunk_size; i++) {
@@ -193,7 +194,7 @@ void DEBUG_draw_ground(uint64_t key, entity_view data) {
             }
 #endif
 
-            DrawTextEco(TextFormat("%.01f %.01f", data.x, data.y), (int16_t)x+15, (int16_t)y+15, 65 , BLACK, 0.0); 
+            DrawTextEco(TextFormat("%d %d", (int)data->x, (int)data->y), (int16_t)x+15, (int16_t)y+15, 65 , ColorAlpha(BLACK, data->tran_time), 0.0); 
         }break;
         
         default:break;
@@ -202,32 +203,31 @@ void DEBUG_draw_ground(uint64_t key, entity_view data) {
 
 static inline float lerp(float a, float b, float t) { return a * (1.0f - t) + b * t; }
 
-void DEBUG_draw_entities(uint64_t key, entity_view data) {
-    world_view *view = game_world_view_get_active();
+void DEBUG_draw_entities(uint64_t key, entity_view * data) {
     uint16_t size = 4;
     uint16_t font_size = (uint16_t)lerp(4.0f, 32.0f, 0.5f/(float)render_camera.zoom);
     float font_spacing = 1.1f;
     float title_bg_offset = 4;
     float fixed_title_offset = 2;
     
-    switch (data.kind) {
+    switch (data->kind) {
         case EKIND_THING: {
-            double x = data.x;
-            double y = data.y;
+            float x = data->x;
+            float y = data->y;
             const char *title = TextFormat("Thing %d", key);
             int title_w = MeasureTextEco(title, font_size, font_spacing);
-            DrawRectangleEco(x-title_w/2-title_bg_offset/2, y-size-font_size-fixed_title_offset, title_w+title_bg_offset, font_size, BLACK);
-            DrawTextEco(title, x-title_w/2, y-size-font_size-fixed_title_offset, font_size, RAYWHITE, font_spacing); 
-            DrawCircleEco(x, y, size, BLUE);
+            DrawRectangleEco(x-title_w/2-title_bg_offset/2, y-size-font_size-fixed_title_offset, title_w+title_bg_offset, font_size, ColorAlpha(BLACK, data->tran_time));
+            DrawTextEco(title, x-title_w/2, y-size-font_size-fixed_title_offset, font_size, ColorAlpha(RAYWHITE, data->tran_time), font_spacing); 
+            DrawCircleEco(x, y, size, ColorAlpha(BLUE, data->tran_time));
         }break;
         case EKIND_PLAYER: {
-            double x = data.x;
-            double y = data.y;
+            float x = data->x;
+            float y = data->y;
             const char *title = TextFormat("Player %d", key);
             int title_w = MeasureTextEco(title, font_size, font_spacing);
-            DrawRectangleEco(x-title_w/2-title_bg_offset/2, y-size-font_size-fixed_title_offset, title_w+title_bg_offset, font_size, BLACK);
-            DrawTextEco(title, x-title_w/2, y-size-font_size-fixed_title_offset, font_size, RAYWHITE, font_spacing); 
-            DrawCircleEco(x, y, size, RED);
+            DrawRectangleEco(x-title_w/2-title_bg_offset/2, y-size-font_size-fixed_title_offset, title_w+title_bg_offset, font_size, ColorAlpha(BLACK, data->tran_time));
+            DrawTextEco(title, x-title_w/2, y-size-font_size-fixed_title_offset, font_size, ColorAlpha(RAYWHITE, data->tran_time), font_spacing); 
+            DrawCircleEco(x, y, size, ColorAlpha(RED, data->tran_time));
         }break;        
         default:break;
     }
@@ -247,4 +247,28 @@ void lerp_entity_positions(uint64_t key, entity_view data) {
         e->y = e->ty;
 #endif
     }
+}
+
+void do_entity_fadeinout(uint64_t key, entity_view * data) {
+    switch (data->tran_effect) {
+        case ETRAN_FADEIN: {
+            data->tran_time += GetFrameTime();
+            
+            if (data->tran_time > 1.0f) {
+                data->tran_effect = ETRAN_NONE;
+                data->tran_time = 1.0f;
+            }
+        }break;
+        
+        case ETRAN_FADEOUT: {
+            data->tran_time -= GetFrameTime();
+            
+            if (data->tran_time < 0.0f) {
+                data->tran_effect = ETRAN_REMOVE;
+                data->tran_time = 0.0f;
+            }
+        }break;
+        
+        default: break;
+    }
 }
\ No newline at end of file
diff --git a/code/apps/client/source/prediction.c b/code/apps/client/source/prediction.c
index 06b150c..8aeab22 100644
--- a/code/apps/client/source/prediction.c
+++ b/code/apps/client/source/prediction.c
@@ -34,4 +34,8 @@ void predict_receive_update(entity_view *d, entity_view *data) {
         data->tx = tx;
         data->ty = ty;
     }
+    
+    data->tran_effect = d->tran_effect;
+    data->tran_time = d->tran_time;
+    zpl_printf("? %f\n", d->tran_time);
 }
diff --git a/code/apps/client/source/world_view.c b/code/apps/client/source/world_view.c
index 6308aeb..952b979 100644
--- a/code/apps/client/source/world_view.c
+++ b/code/apps/client/source/world_view.c
@@ -8,7 +8,7 @@
 int32_t tracker_read_remove(librg_world *w, librg_event *e) {
     int64_t entity_id = librg_event_entity_get(w, e);
     world_view *view = (world_view*)librg_world_userdata_get(w);
-    entity_view_destroy(&view->entities, entity_id);
+    entity_view_mark_for_removal(&view->entities, entity_id);
     return 0;
 }
 
@@ -42,19 +42,17 @@ int32_t tracker_read_create(librg_world *w, librg_event *e) {
     size_t actual_length = librg_event_size_get(w, e);
     char *buffer = librg_event_buffer_get(w, e);
     world_view *view = (world_view*)librg_world_userdata_get(w);
-#ifdef WORLD_LAYERING
-    if (view->active_layer_id != WORLD_TRACKER_LAYERS-1) {
-        // NOTE(zaklaus): reject updates from smaller layers
-        return 0;
-    }
-#endif
+
     entity_view data = entity_view_unpack_struct(buffer, actual_length);
+    data.ent_id = entity_id;
     data.layer_id = view->active_layer_id;
+    data.tran_time = 0.0f;
     if (data.flag & EFLAG_INTERP) {
         data.tx = data.x;
         data.ty = data.y;
     }
     entity_view_update_or_create(&view->entities, entity_id, data);
+    entity_view_mark_for_fadein(&view->entities, entity_id);
     return 0;
 }
 
diff --git a/code/common/entity_view.c b/code/common/entity_view.c
index 2c34f3e..c710da0 100644
--- a/code/common/entity_view.c
+++ b/code/common/entity_view.c
@@ -50,6 +50,18 @@ entity_view *entity_view_get(entity_view_tbl *map, uint64_t ent_id) {
     return entity_view_tbl_get(map, ent_id);
 }
 
-void entity_view_map(entity_view_tbl *map, void (*map_proc)(uint64_t key, entity_view value)) {
-    entity_view_tbl_map(map, map_proc);
+void entity_view_map(entity_view_tbl *map, void (*map_proc)(uint64_t key, entity_view * value)) {
+    entity_view_tbl_map_mut(map, map_proc);
+}
+
+void entity_view_mark_for_removal(entity_view_tbl *map, uint64_t ent_id) {
+    entity_view *view = entity_view_tbl_get(map, ent_id);
+    view->tran_effect = ETRAN_FADEOUT;
+    view->tran_time = 1.0f;
+}
+
+void entity_view_mark_for_fadein(entity_view_tbl *map, uint64_t ent_id) {
+    entity_view *view = entity_view_tbl_get(map, ent_id);
+    view->tran_effect = ETRAN_FADEIN;
+    view->tran_time = 0.0f;
 }
diff --git a/code/common/entity_view.h b/code/common/entity_view.h
index 092091d..1246e93 100644
--- a/code/common/entity_view.h
+++ b/code/common/entity_view.h
@@ -18,7 +18,16 @@ typedef enum {
     FORCE_EFLAG_UINT16 = UINT16_MAX
 } entity_flag;
 
+typedef enum {
+    ETRAN_NONE,
+    ETRAN_FADEOUT,
+    ETRAN_FADEIN,
+    ETRAN_REMOVE,
+    FORCE_ETRAN_UINT8 = UINT8_MAX
+} entity_transition_effect;
+
 typedef struct entity_view {
+    int64_t ent_id;
     entity_kind kind;
     entity_flag flag;
     float x;
@@ -31,6 +40,10 @@ typedef struct entity_view {
     // NOTE(zaklaus): internals
     uint8_t layer_id;
     uint64_t last_update;
+    
+    // NOTE(zaklaus): fade in-out effect
+    entity_transition_effect tran_effect;
+    float tran_time;
 } entity_view;
 
 ZPL_TABLE_DECLARE(, entity_view_tbl, entity_view_tbl_, entity_view);
@@ -44,7 +57,10 @@ void entity_view_update_or_create(entity_view_tbl *map, uint64_t ent_id, entity_
 void entity_view_destroy(entity_view_tbl *map, uint64_t ent_id);
 
 entity_view *entity_view_get(entity_view_tbl *map, uint64_t ent_id);
-void entity_view_map(entity_view_tbl *map, void (*map_proc)(uint64_t key, entity_view value));
+void entity_view_map(entity_view_tbl *map, void (*map_proc)(uint64_t key, entity_view * value));
 
 size_t entity_view_pack_struct(void *data, size_t len, entity_view view);
 entity_view entity_view_unpack_struct(void *data, size_t len);
+
+void entity_view_mark_for_removal(entity_view_tbl *map, uint64_t ent_id);
+void entity_view_mark_for_fadein(entity_view_tbl *map, uint64_t ent_id);
\ No newline at end of file
diff --git a/code/common/game.h b/code/common/game.h
index c2e25f7..6c971b2 100644
--- a/code/common/game.h
+++ b/code/common/game.h
@@ -18,7 +18,8 @@ world_view *game_world_view_get(uint16_t idx);
 void game_world_view_set_active_by_idx(uint16_t idx);
 void game_world_view_set_active(world_view *view);
 void game_world_view_cycle_active(uint8_t dir);
-void game_world_view_active_entity_map(void (*map_proc)(uint64_t key, entity_view value));
+void game_world_view_active_entity_map(void (*map_proc)(uint64_t key, entity_view * value));
+void game_world_cleanup_entities(void);
 
 //~ NOTE(zaklaus): viewer -> host actions
 void game_action_send_keystate(float x, float y, uint8_t use, uint8_t sprint);
\ No newline at end of file
diff --git a/code/vendors/zpl.h b/code/vendors/zpl.h
index f29f35e..da9a6e4 100644
--- a/code/vendors/zpl.h
+++ b/code/vendors/zpl.h
@@ -31,6 +31,8 @@ GitHub:
   https://github.com/zpl-c/zpl
 
 Version History:
+  14.1.0  - add hashtable map_mut method
+  14.0.1  - fix zpl_array_remove_at boundary bug
   14.0.0  - heap memory allocator analysis
 
   13.4.1  - adt optimizations
@@ -358,8 +360,8 @@ License:
 #define ZPL_H
 
 #define ZPL_VERSION_MAJOR 14
-#define ZPL_VERSION_MINOR 0
-#define ZPL_VERSION_PATCH 2
+#define ZPL_VERSION_MINOR 1
+#define ZPL_VERSION_PATCH 0
 #define ZPL_VERSION_PRE ""
 
  // file: zpl_hedley.h
@@ -4299,6 +4301,7 @@ License:
      PREFIX void ZPL_JOIN2(FUNC, grow)(NAME * h);                                                                       \
      PREFIX void ZPL_JOIN2(FUNC, rehash)(NAME * h, zpl_isize new_count);                                                    \
      PREFIX void ZPL_JOIN2(FUNC, map)(NAME * h, void (*map_proc)(zpl_u64 key, VALUE value));                                                    \
+     PREFIX void ZPL_JOIN2(FUNC, map_mut)(NAME * h, void (*map_proc)(zpl_u64 key, VALUE * value));                                                    \
      PREFIX void ZPL_JOIN2(FUNC, remove)(NAME * h, zpl_u64 key);
 
      #define ZPL_TABLE_DEFINE(NAME, FUNC, VALUE)                                                                            \
@@ -4397,6 +4400,13 @@ License:
              map_proc(h->entries[i].key, h->entries[i].value); \
          } \
      } \
+     void ZPL_JOIN2(FUNC, map_mut)(NAME * h, void (*map_proc)(zpl_u64 key, VALUE * value)) {                                                    \
+         ZPL_ASSERT_NOT_NULL(h); \
+         ZPL_ASSERT_NOT_NULL(map_proc); \
+         for (zpl_isize i = 0; i < zpl_array_count(h->entries); ++i) { \
+             map_proc(h->entries[i].key, &h->entries[i].value); \
+         } \
+     } \
      \
      void ZPL_JOIN2(FUNC, set)(NAME * h, zpl_u64 key, VALUE value) {                                                        \
          zpl_isize index;                                                                                                   \