diff --git a/assets/characters/littleguy.json b/assets/characters/littleguy.json
index b438ab6..c8339a9 100644
--- a/assets/characters/littleguy.json
+++ b/assets/characters/littleguy.json
@@ -1,10 +1,10 @@
 {
     "name": "little guy",
     "speedtime": 8,
-    "acceleration_x": 0.001,
-    "acceleration_y": 0.001,
-    "speed_x": 1,
-    "speed_y": 1,
+    "acceleration_x": 64.0,
+    "acceleration_y": 64.0,
+    "speed_x": 64.0,
+    "speed_y": 64.0,
     "sprite_mappings": [
 	{
 	    "state": [
diff --git a/assets/properties.json b/assets/properties.json
index 2a75db1..368f298 100644
--- a/assets/properties.json
+++ b/assets/properties.json
@@ -3,7 +3,7 @@
 	"some.key.with.a.value": "value",
 	"game.screenwidth": "640",
 	"game.screenheight": "480",
-	"physics.gravity.y": "32.0",
-	"physics.gravity.terminal_y": "120.0"
+	"physics.gravity.y": "1024.0",
+	"physics.drag.y": "1.0"
     }
 }
diff --git a/assets/sidescroller.tmj b/assets/sidescroller.tmj
index a5436c7..5d12219 100644
--- a/assets/sidescroller.tmj
+++ b/assets/sidescroller.tmj
@@ -39,8 +39,8 @@
                  "type":"actor",
                  "visible":true,
                  "width":16,
-                 "x":304.261511065887,
-                 "y":258.471635716103
+                 "x":294.721953701349,
+                 "y":58.7769015517682
                 }],
          "opacity":1,
          "type":"objectgroup",
diff --git a/deps/libakgl b/deps/libakgl
index 314ce5e..941eeb2 160000
--- a/deps/libakgl
+++ b/deps/libakgl
@@ -1 +1 @@
-Subproject commit 314ce5e10d0b2d2eb55e5a53267a4cba07a5b7eb
+Subproject commit 941eeb2493939fad2793c0c8a499509a2bcbe914
diff --git a/include/akgltest.h b/include/akgltest.h
index 0992f72..6ad1532 100644
--- a/include/akgltest.h
+++ b/include/akgltest.h
@@ -53,7 +53,7 @@ akerr_ErrorContext AKERR_NOIGNORE *akgltest_iterate_mapmenu(void);
 akerr_ErrorContext AKERR_NOIGNORE *akgltest_iterate_running(void);
 akerr_ErrorContext AKERR_NOIGNORE *akgltest_iterate_waitforinput(void);
 akerr_ErrorContext AKERR_NOIGNORE *akgltest_load_assets();
-akerr_ErrorContext AKERR_NOIGNORE *akgltest_menupointer_logic_movement(akgl_Actor *obj, SDL_Time curtime);
+akerr_ErrorContext AKERR_NOIGNORE *akgltest_menupointer_logic_movement(akgl_Actor *obj, float32_t dt);
 akerr_ErrorContext AKERR_NOIGNORE *akgltest_release_actor(char *actorname);
 akerr_ErrorContext AKERR_NOIGNORE *akgltest_set_actor_visible(char *actorname, bool visible);
 akerr_ErrorContext AKERR_NOIGNORE *akgltest_set_gamemode_menu(akgl_Actor *appstate, SDL_Event *event);
diff --git a/src/actors.c b/src/actors.c
index 67fe1fd..d147031 100644
--- a/src/actors.c
+++ b/src/actors.c
@@ -1,6 +1,6 @@
 #include <akgltest.h>
 
-akerr_ErrorContext AKERR_NOIGNORE *akgltest_menupointer_logic_movement(akgl_Actor *obj, SDL_Time curtime)
+akerr_ErrorContext AKERR_NOIGNORE *akgltest_menupointer_logic_movement(akgl_Actor *obj, float32_t dt)
 {
     PREPARE_ERROR(e);
     FAIL_ZERO_RETURN(e, obj, AKERR_NULLPOINTER, "NULL actor");
@@ -19,6 +19,7 @@ akerr_ErrorContext AKERR_NOIGNORE *akgltest_menupointer_logic_movement(akgl_Acto
     }
     obj->y = 85 + (menuselection * 100);
     AKGL_BITMASK_DEL(obj->state, (AKGL_ACTOR_STATE_MOVING_UP | AKGL_ACTOR_STATE_MOVING_DOWN));
+    FAIL(e, AKGL_ERR_LOGICINTERRUPT, "NULL");
     SUCCEED_RETURN(e);
 }
 
diff --git a/src/gamemodes.c b/src/gamemodes.c
index d48255a..c202737 100644
--- a/src/gamemodes.c
+++ b/src/gamemodes.c
@@ -151,8 +151,7 @@ akerr_ErrorContext AKERR_NOIGNORE *akgltest_iterate_running(void)
     akgl_Iterator opflags;
     akgl_Actor *player;
     TTF_Font *gamefont;
-    char fpsText[32];
-    char velocityText[128];
+    char screenText[128];
     int count;
 
     PREPARE_ERROR(e);
@@ -164,38 +163,69 @@ akerr_ErrorContext AKERR_NOIGNORE *akgltest_iterate_running(void)
 
     PASS(e, akgl_game_update(NULL));
 
-    memset((char *)&fpsText, 0x00, 32);
-    snprintf((char *)&fpsText, 31, "FPS : %d", game.fps);
+    memset((char *)&screenText, 0x00, 32);
+    snprintf((char *)&screenText, 127, "FPS : %d", game.fps);
     PASS(e, akgl_text_rendertextat(
 	     gamefont,
-	     (char *)&fpsText,
+	     (char *)&screenText,
 	     (SDL_Color){255, 255, 255, 255},
 	     0,
 	     450,
 	     10)
 	);
 
-    memset((char *)&velocityText, 0x00, 128);
-    snprintf((char *)&velocityText, 127, "AX: %f", player->vx);
+    memset((char *)&screenText, 0x00, 128);
+    snprintf((char *)&screenText, 127, "VX: %f", player->vx);
     PASS(e, akgl_text_rendertextat(
 	     gamefont,
-	     (char *)&velocityText,
+	     (char *)&screenText,
 	     (SDL_Color){255, 255, 255, 255},
 	     0,
 	     10,
 	     10)
 	);
-    memset((char *)&velocityText, 0x00, 128);
-    snprintf((char *)&velocityText, 127, "AY: %f", player->vy);
+    memset((char *)&screenText, 0x00, 128);
+    snprintf((char *)&screenText, 127, "VY: %f", player->vy);
     PASS(e, akgl_text_rendertextat(
 	     gamefont,
-	     (char *)&velocityText,
+	     (char *)&screenText,
 	     (SDL_Color){255, 255, 255, 255},
 	     0,
 	     10,
 	     30)
 	);
+    memset((char *)&screenText, 0x00, 128);
+    snprintf((char *)&screenText, 127, "DY: %f", physics.drag_y);
+    PASS(e, akgl_text_rendertextat(
+	     gamefont,
+	     (char *)&screenText,
+	     (SDL_Color){255, 255, 255, 255},
+	     0,
+	     10,
+	     60)
+	);
     
+    memset((char *)&screenText, 0x00, 128);
+    snprintf((char *)&screenText, 127, "PX: %f", player->x);
+    PASS(e, akgl_text_rendertextat(
+	     gamefont,
+	     (char *)&screenText,
+	     (SDL_Color){255, 255, 255, 255},
+	     0,
+	     220,
+	     10)
+	);
+    memset((char *)&screenText, 0x00, 128);
+    snprintf((char *)&screenText, 127, "PY: %f", player->y);
+    PASS(e, akgl_text_rendertextat(
+	     gamefont,
+	     (char *)&screenText,
+	     (SDL_Color){255, 255, 255, 255},
+	     0,
+	     220,
+	     30)
+	);
+
     PASS(e, renderer.frame_end(&renderer));
     SUCCEED_RETURN(e);
 }