diff --git a/src/draw.c b/src/draw.c
index 0734a5e..9fe519e 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -1,6 +1,7 @@
 #include "draw.h"
 #include "game.h"
 #include <SDL2/SDL_mutex.h>
+#include <SDL2/SDL_render.h>
 #include <time.h>
 
 Vect viewport_pos;
@@ -280,7 +281,7 @@ void new_update_viewport(Body const * const pl) {
     static double dirchange = 0;
     static Vect last_plpos = {};
     if (last_plpos.x == 0 && last_plpos.y == 0)
-        last_plpos = player.physics->position;
+        last_plpos = pl->position;
 
     static Vect lmove = {};
 
@@ -296,15 +297,16 @@ void new_update_viewport(Body const * const pl) {
 
     Vect screen_dist = vect_add(in_view(pl->position), vect_scalar(lmove, -1));
 
+    static double swap = 0;
     if (iv.x > width 
         || (iv.x < 0
             || iv.y > height
             || iv.y < 0)) 
         recover = true;
 
-    Vect delta = vect_add(vect_scalar(player.physics->position, -1), last_plpos);
+    Vect delta = vect_add(vect_scalar(pl->position, -1), last_plpos);
     double dist_change = vect_mag(delta);
-    if (true || (recover) //|| vect_mag((Vect){pl->vel.x, 0}) > 0.4 
+    if ((recover) //|| vect_mag((Vect){pl->vel.x, 0}) > 0.4 
             || (dist_change > width / 100)) {
         if (iv.x < width / 6) {
             target = right_pos;
@@ -313,7 +315,7 @@ void new_update_viewport(Body const * const pl) {
         }
         lmove = target;
 
-        last_plpos = player.physics->position;
+        last_plpos = pl->position;
     }
 
     if (recover)
@@ -352,11 +354,11 @@ void new_update_viewport(Body const * const pl) {
         v = -v;
 
     // move towards target a set proportion
-    Vect urgency = vect_add(target, vect_scalar(player.physics->position, -1));
+    Vect urgency = vect_add(target, vect_scalar(pl->position, -1));
     Vect p = vect_add(target, vect_scalar(viewport_pos, -1));
 
     double proportion = (sigmoid(time_delta) / 100);
-    proportion = 2 * player.physics->vel.x / (width);
+    proportion = 2 * (pl->vel.x * pl->vel.x / (width));
     proportion = proportion < 0 ? -proportion : proportion;
 
     proportion > 0.4 ? proportion = 0.4 : 0;
@@ -496,7 +498,7 @@ void draw_text(SDL_Renderer *rend, Vect pos, struct colour colour, char *text) {
     static SDL_Renderer *ren = NULL;
     static TTF_Font* font = NULL;
     if (!font) {
-        font = TTF_OpenFont("TerminusTTF.ttf", 18);
+        font = TTF_OpenFont("TerminusTTF.ttf", 22);
         const char *err = SDL_GetError();
         if (err) {
             printf("%s\n", err);
@@ -521,10 +523,45 @@ void draw_text(SDL_Renderer *rend, Vect pos, struct colour colour, char *text) {
 
 }
 
+int draw_end_screen(SDL_Renderer *ren) {
+    struct environment scene = get_scene_at(viewport_pos, level);
+
+    struct colour bg = scene.colours.bg;
+    struct colour colour = scene.colours.fg1;
+
+    SDL_SetRenderDrawColor(ren, bg.r, bg.g, bg.b,255);
+    SDL_RenderClear(ren);
+
+    int margin = height / 10;
+  //  Vect position = {.x = width - width / 10, .y = height - margin};
+
+    int minutes = level_time / 60000;
+    float seconds = level_time * 0.001;
+    char time_string[250];
+    snprintf(time_string, 250, "TIME: %d:%.4f", minutes, seconds);
+    char * end_str = "Level over.";
+    char * ct_str = "Press any key to continue.";
+    char qual_str[250];
+    snprintf(qual_str, 250, "Physics quality: %d", quality);
+
+    Vect position  = {.x = width/3, .y = height / 4};
+    draw_text(ren, position, colour, end_str);
+    position.y += 40;
+    draw_text(ren, position, colour, time_string);
+    position.y += 40;
+    draw_text(ren, position, colour, qual_str);
+    position.y += 40;
+    draw_text(ren, position, colour, ct_str);
+
+    SDL_RenderPresent(ren);
+    return 0;
+}
+
+
 void draw_level_time(SDL_Renderer *ren, struct environment * e) {
     
     int margin = height / 10;
-    Vect position = {.x = margin, .y = height - margin};
+    Vect position = {.x = width - width / 10, .y = height - margin};
 
     struct colour colour = e->colours.fg1;
 
@@ -558,8 +595,7 @@ void redraw_buffer(SDL_Renderer * ren) {
 
     if (SDL_LockMutex(player.physics->lock) == 0){
         lplayer = *player.physics;
-        new_update_viewport(&lplayer);
-        SDL_UnlockMutex(player.physics->lock);
+        update_viewport(&lplayer);
     } else {
         return;
     }
@@ -577,6 +613,7 @@ void redraw_buffer(SDL_Renderer * ren) {
     struct environment scene = get_scene_at(viewport_pos, level);
     draw_environment(ren, &scene);
     draw_level_time(ren, &scene);
+    SDL_UnlockMutex(player.physics->lock);
 
     for (int i=0; i < world.items.size; i++) {
         world_thing thing;
diff --git a/src/draw.h b/src/draw.h
index 3180d7a..ded3047 100644
--- a/src/draw.h
+++ b/src/draw.h
@@ -37,5 +37,6 @@ extern int width, height;
 
 void draw_text(SDL_Renderer *ren, Vect pos, struct colour colour, char *text); 
 
+int draw_end_screen(SDL_Renderer *ren); 
 
 #endif
diff --git a/src/game.c b/src/game.c
index e3c774e..e64c8db 100644
--- a/src/game.c
+++ b/src/game.c
@@ -6,6 +6,7 @@
 
 #define FLOOR_THICKNESS 200 
 #define MAX_ROPE_GRAB_LEN 80000
+#define MIN_PHYSICS_STEP 2.0
 
 #define BREAKPOINT *(int *)0 = 1;
 
@@ -14,9 +15,14 @@ GlobWorld world;
 player_st *glob_player;
 SDL_Renderer *debug_ren;
 
+bool in_game;
+bool game_paused;
 int level;
+int quality = 100;
 long level_time;
 
+int get_floor_ceiling(); 
+
 /* array of all the things in the world and their kinds */
 //world_thing *world;
 
@@ -26,7 +32,6 @@ void process_keydown(SDL_Keysym key);
 void process_keyup(SDL_Keysym key);
 
 void add_to_world(world_thing thing); 
-void step(int interval);
 void set_motor_timeout(Body *thing, int motorID, uint32_t timeout); 
 void set_motor_status(Body *thing, int motorID, bool run); 
 void stop_pull_rope(void); 
@@ -553,8 +558,9 @@ void destroy_physics_collection(struct physics_collection *s) {
     free(s->items);
 }
 
-int get_floor_ceiling(); 
+
 void next_level() {
+    SDL_LockMutex(player.physics->lock);
     Vect v;
     v.x = 0;
     v.y = 0;
@@ -588,6 +594,9 @@ void next_level() {
     player.physics->position = v;
     player.physics->next_position = v;
 
+    quality = 100;
+    level_timer_update(true);
+    SDL_UnlockMutex(player.physics->lock);
 
 }
 
@@ -1081,15 +1090,22 @@ void advance_thing(Body * thing) {
     }
     time_delta *= 0.000001; // convert to ms from ns
 
-    thing->last_advance_time = now;
 
     // cap the time delta: simulatino will slow down
 //    printf("delta: %f\n", time_delta);
     if (time_delta > 19) {
         printf("ERROR too slow: %f\n", time_delta);
         time_delta = 19;
+        quality--;
     }
 
+    if (time_delta < MIN_PHYSICS_STEP) {
+        SDL_Delay(MIN_PHYSICS_STEP);
+        advance_thing(thing); 
+        return;
+    }
+    thing->last_advance_time = now;
+
     // collisions
     if ((numcols = process_collisions(thing, &translation))) {
         /*double check = vect_scalar_projection(translation, thing->vel);*/
@@ -1266,15 +1282,16 @@ void advance_thing(Body * thing) {
         (*thing).vel.y = 0; 
     }
 
+    if (thing->lock) {
+        SDL_LockMutex(thing->lock);
+    }
+    thing->position = thing->next_position;
+
     double oldx = thing->position.x;
     double oldy = thing->position.y;
     thing->next_position.x +=  (thing->vel.x * 1/2 * (double)time_delta); 
     thing->next_position.y += (thing->vel.y * 1/2 * (double)time_delta); 
 
-    if (thing->lock) {
-        SDL_LockMutex(thing->lock);
-    }
-    thing->position = thing->next_position;
 
     if (!thing->collision_poly[0].y) {
         thing->updateCollisionPoly(thing);
@@ -1316,7 +1333,6 @@ void get_projectile(Projectile** proj) {
 void advance_things(void) {
     int numcols;
     Vect translation;
-    level_timer_update(false);
     for (int i = 0; i < world.items.size; i++) {
         switch (world.get(i).kind) {
             case PLAYER_W :
@@ -1458,6 +1474,7 @@ void startgame(SDL_Renderer * ren) {
     viewport_pos.y = 0;
 
     level_timer_update(true);
+    game_paused = 0;
     //get_room();
 }
 
@@ -1548,17 +1565,21 @@ int get_rand(int seed) {
 }
 
 
-void step(int interval) { 
 
+int step(void) { 
     if (player.physics->position.x > world.uniques_index[ROOM_W]->room
             ->floor.items[world.uniques_index[ROOM_W]->room->floor.numItems - 1]->position.x) {
-        SDL_Delay(1000);
-        next_level();
-        level_timer_update(true);
+        return 1;
+    }
+    if (player.physics->position.x > world.uniques_index[ROOM_W]->room
+            ->floor.items[3]->position.x) {
+        level_timer_update(false);
+    } else {
     }
 
-    advance_things();
+    if (in_game && !game_paused) {
+        advance_things();
+    }
+    return 0;
 }
 
-
-
diff --git a/src/game.h b/src/game.h
index aed6d9a..122e9a7 100644
--- a/src/game.h
+++ b/src/game.h
@@ -12,6 +12,8 @@
 
 extern GlobWorld world;
 extern int level;
+extern bool in_game;
+extern int quality;
 
 void handle_input_event(SDL_Event event);
 
@@ -22,12 +24,17 @@ bool get_motor_active(Body *thing, int i);
 
 int get_rand(int seed);
 
+void next_level(); 
+
+int step(void);
+
 /* array of all the things in the world and their kinds */
+
 extern void startgame(SDL_Renderer * ren) ;
 extern void process_keydown(SDL_Keysym key);
 extern void process_keyup(SDL_Keysym key);
-extern void step(int interval);
 extern player_st player;
 extern long level_time;
 
+extern bool game_paused;
 #endif
diff --git a/src/main.c b/src/main.c
index 68ce80b..938dfd1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,4 @@
+#include <SDL2/SDL_mutex.h>
 #include <SDL2/SDL_scancode.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -15,6 +16,19 @@
 const int screen_width = 800;
 const int screen_height = 600;
 
+SDL_sem *resume;
+
+long int *times;
+
+struct sg_times_list {
+    long *times;
+    int size;
+    int capacity;
+    void (*sort)(void);
+};
+
+struct sg_times_list save_times_lst;
+
 struct SDL_Window* make_window(void) {
     if (SDL_Init(SDL_INIT_EVERYTHING) != 0) { 
         printf("error initializing SDL: %s\n", SDL_GetError()); 
@@ -30,18 +44,30 @@ struct SDL_Window* make_window(void) {
 
 
 void redraw(struct SDL_Renderer * ren) {
-    // check time
-    // redraw if 1/60th of second passed
-    
     SDL_RenderClear(ren);
     redraw_buffer(ren);
     SDL_RenderPresent(ren);
 }
 
 int physics_loop(void *ptr) {
-    while (true) {
-        step(10);
-        SDL_Delay(10);
+    game_paused = 1;
+    SDL_Delay(1000);
+    game_paused = 0;
+    while (1) {
+        if (step())  {
+            // display end level screen
+            game_paused = true;
+            SDL_Delay(1000);
+            in_game = false;
+            SDL_SemWait(resume);
+            SDL_LockMutex(player.physics->lock);
+            game_paused = true;
+            in_game = true;
+            next_level();
+            SDL_UnlockMutex(player.physics->lock);
+            SDL_Delay(1000);
+            game_paused = 0;
+        }
     }
 }
 
@@ -50,7 +76,7 @@ int game(void) {
     LOGLEVEL = DEBUG;
     STDOUTLEVEL = DEBUG;
 
-    SDL_SetHint( SDL_HINT_RENDER_SCALE_QUALITY, "2" );
+    //SDL_SetHint( SDL_HINT_RENDER_SCALE_QUALITY, "2" );
 
     logwrite(INFO, "Starting\n");
     SDL_Window * win = make_window();
@@ -60,12 +86,16 @@ int game(void) {
     queue_for_cleanup(win, WINDOW);
     queue_for_cleanup(ren, RENDERER);
 
+    in_game = true;
+    resume = SDL_CreateSemaphore(0);
+
   //  IMG_Init(IMG_INIT_PNG | IMG_INIT_JPG);
 
     if (ren == NULL) {
         SDL_DestroyWindow(win);
         SDL_Quit();
     }
+
     TTF_Init();
 
     int close = 0;
@@ -75,10 +105,9 @@ int game(void) {
     SDL_Thread *physics_thread;
     int ignore;
 
-    bool once = true;
     startgame(ren);
 
-//    physics_thread = SDL_CreateThread(physics_loop, "Physics", (void *)NULL);
+    physics_thread = SDL_CreateThread(physics_loop, "Physics", (void *)ren);
 
     while (!close)  {
 
@@ -92,6 +121,9 @@ int game(void) {
                     if (event.key.keysym.scancode == SDL_SCANCODE_ESCAPE) {
                         return 0;
                     }
+                    if (!SDL_SemValue(resume)) {
+                        SDL_SemPost(resume);
+                    }
                 case SDL_KEYUP:
                 case SDL_MOUSEBUTTONDOWN:
                 case SDL_MOUSEBUTTONUP:
@@ -99,14 +131,84 @@ int game(void) {
             }
         }
         /* Redraw Screen */
-        step(10);
-        redraw(ren);
+//        step(10);
+
+        if (!in_game) {
+            draw_end_screen(ren);
+        } else {
+            redraw(ren);
+        }
     }
+}
+
+
+int long_comparator(const void *a, const void *b, void *non) {
+    long A = *(long *)a;
+    long B = *(long *)b;
+
+    return A - B;
+}
+
+void sort_times(void) {
+    qsort_r(save_times_lst.times, save_times_lst.size, sizeof(long), long_comparator, NULL);
+}
+
+int load_score_times(char *filename) {
+    FILE *f = fopen(filename, "r");
+
+    if (f) {
+        // get file size
+        fseek(f, 0L, SEEK_END);
+        long sz = ftell(f);
+        fseek(f, 0L, SEEK_SET);
+        char *text = malloc((sz + 1) * (sizeof(char))); 
+
+        // read file
+        fread(text,sizeof(char),sz, f); 
+        fclose(f);
+
+        int count = 1;
+        for (int i = 0; i < strlen(text); i++) {
+            if (text[i] == '\n') {
+                count++;
+            }
+        }
+
+        long *times = malloc(count * sizeof(long));
+        char *saveptr;
+
+        // extract times
+        char * token = strtok_r(text, "\n", &saveptr);
+        int i = 0;
+        while (token != NULL) {
+            if (strlen(token) > 2) {
+                times[i] = atol(token);
+                i++;
+            }
+            token = strtok_r(NULL, "\n", &saveptr);
+        }
+        save_times_lst = (struct sg_times_list){.size=i, .capacity = count, .times=times, .sort=sort_times};
+        save_times_lst.sort();
+    } else {
+        perror("loading times");
+        save_times_lst = (struct sg_times_list){.size=0, .capacity = 5, .times=calloc(5, sizeof(long)), .sort=sort_times};
+    }
+    for (int i = 0; i < save_times_lst.size; i++) {
+        printf("%ld\n", save_times_lst.times[i]);
+    }
+
+    return 0;
+}
+
 
+long get_best_time(void) {
+    save_times_lst.sort();
+    return save_times_lst.times[0];
 }
 
 int main (int argc, char** argv)  {
 
+    load_score_times("savegame");
     game();
     SDL_Quit();
     //empty_cleanup_queue();
diff --git a/src/types.h b/src/types.h
index 574c5cc..1190f6d 100644
--- a/src/types.h
+++ b/src/types.h
@@ -220,10 +220,9 @@ typedef struct world GlobWorld;
 
 enum {
 //    E_ROOM_WIDTH = 100000,
-    E_ROOM_WIDTH = 40000,
+    E_ROOM_WIDTH = 10000,
     E_ROOM_RES = 500,
     E_ROOM_TILES = E_ROOM_WIDTH / E_ROOM_RES,
 };
 
-
 #endif