diff --git a/bin/back b/bin/back
index 1752b76..fa420d6 100755
Binary files a/bin/back and b/bin/back differ
diff --git a/levels/level_02/room_0 b/levels/level_02/room_0
index b92f358..9c0bf8d 100644
--- a/levels/level_02/room_0
+++ b/levels/level_02/room_0
@@ -17,14 +17,22 @@ Blocks :
 [ 10.0, 18.0, -36.0, 20.0, 2.0, 4.0, 0.0, 0.0, 192, 192, 192]
 [ 28.0, 30.0, -36.0, 4.0, 2.0, 4.0, 0.0, 0.0, 32, 192, 32]     // cp3
 
+[32.0, 30.0, -35.0, 6.0, 2.0,  2.0, 0.0, 0.0, 192, 192, 192]   // 4 - support
+[42.0, 34.0, -35.0, 2.0, 2.0, 8.0, 0.0, 0.0, 192, 192, 192]
+[42.0, 34.0, -19.0, 2.0, 2.0, 8.0, 0.0, 0.0, 192, 192, 192]
+[42.0, 34.0,  -3.0, 2.0, 2.0, 8.0, 0.0, 0.0, 192, 192, 192]
+[30.0, 38.0,   3.0, 6.0, 2.0,  2.0, 0.0, 0.0, 192, 192, 192]
+[7.0, 44.0,  2.0, 4.0, 1.0, 4.0, 0.0, 0.0, 32, 192, 32]        // cp4
+
 Entities:
 [8.0, 1.0 , 8.0, 2.0, 2.0, 2.0, 0.0, 0.0, 255, 255, 128, 1, 0, 8, 100, 1, 128, 128, 128]
 [-8.0, 1.0, 8.0, 2.0, 2.0, 2.0, 0.0, 0.0, 255, 255, 255, 1, 0, 6, get over it, 192, 192, 192]
 [8.5, 1.5 , 8.5, 1.0, 1.0, 1.0, 0.0, 0.0, 192, 192, 192, 1, 0, 7, levels/level_01/, 7, great, 192, 192, 192]
 
 [-3.5, 13.0,   0.5, 1.0, 1.0, 1.0, 0.0, 0.0, 255, 255, 128, 10, 0, 0]     // cp1 coin
-[-3.5, 23.0, -15.5, 1.0, 1.0, 1.0, 0.0, 0.0, 255, 255, 128, 10, 0, 0]     // cp2 coin
-[29.5, 33.0, -34.0, 1.0, 1.0, 1.0, 0.0, 0.0, 255, 255, 255, 10, 0, 0]     // cp3 coin
+[-3.5, 23.0, -15.5, 1.0, 1.0, 1.0, 0.0, 0.0, 255, 255, 128, 20, 0, 0]     // cp2 coin
+[29.5, 33.0, -34.0, 1.0, 1.0, 1.0, 0.0, 0.0, 255, 255, 255, 30, 0, 0]     // cp3 coin
+[ 8.5, 47.0,   3.5, 1.0, 1.0, 1.0, 0.0, 0.0, 255, 255, 255, 40, 0, 0]     // cp4 coin
 
 
 [-4.0,  0.0, -13.0, 2.0, 2.0, 2.0, 0.0, 0.0, 255, 255, 255, 1, 0, 9, 1.4, 1.4, 0]  // 1-1
@@ -105,6 +113,16 @@ Entities:
 [ 20.0, 28.0, -35.0, 2.0, 2.0, 2.0, 0.71, 0.0, 255, 255, 255, 1, 0, 12, 6, 0]
 [ 21.5, 30.0, -35.0, 2.0, 2.0, 2.0, 0.71, 0.0, 255, 255, 255, 1, 0, 12, 7, 0]
 
+
+[38.0, 32.0, -35.0, 2.0, 2.0, 2.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]   // 4 - math
+[42.0, 34.0, -24.0, 2.0, 2.0, 2.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]
+[42.0, 34.0, -8.0, 2.0, 2.0, 2.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]
+[38.0, 36.0,  3.0, 2.0, 2.0, 2.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]
+[26.0, 40.0,  3.5, 1.0, 1.0, 1.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]
+[22.0, 41.0,  3.5, 1.0, 1.0, 1.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]
+[18.0, 42.0,  3.5, 1.0, 1.0, 1.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]
+[14.0, 43.0,  3.5, 1.0, 1.0, 1.0, 0.0, 0.0, 192, 192, 192, 1, 0, 13, 0, 3.5]
+
 Weight :
 0
 
diff --git a/obj/entities.o b/obj/entities.o
index 5bc1825..a47e7fb 100644
Binary files a/obj/entities.o and b/obj/entities.o differ
diff --git a/obj/generation.o b/obj/generation.o
index 6f57b42..cb2daee 100644
Binary files a/obj/generation.o and b/obj/generation.o differ
diff --git a/obj/main.o b/obj/main.o
index 7ba04a4..0a14127 100644
Binary files a/obj/main.o and b/obj/main.o differ
diff --git a/obj/move.o b/obj/move.o
index b4361d8..32d526c 100644
Binary files a/obj/move.o and b/obj/move.o differ
diff --git a/res/pi.jpeg b/res/pi.jpeg
new file mode 100644
index 0000000..1eed52b
Binary files /dev/null and b/res/pi.jpeg differ
diff --git a/res/pi.png b/res/pi.png
new file mode 100644
index 0000000..4cf3fae
Binary files /dev/null and b/res/pi.png differ
diff --git a/src/entities.c b/src/entities.c
index 85b4409..43e019f 100644
--- a/src/entities.c
+++ b/src/entities.c
@@ -182,6 +182,10 @@ void math_block(double x, double y, double z, double w, double h, double d, doub
     if(ent->metad1 > -0.9) {
         ent->metad1 = maxd(ent->metad1 - (double)dtime, 0.0);
     }
+    if(mathResult == FAILURE && ent->metad1 > 0.1) {
+        mathResult = IDLE;
+        ent->metad1 = 0.1;
+    }
 }
 
 void active_math(float dtime, int* hp, int* dmg, entity* ent, cube_0* ret) {
diff --git a/src/generation.c b/src/generation.c
index b8d8226..8783857 100644
--- a/src/generation.c
+++ b/src/generation.c
@@ -147,7 +147,7 @@ void init_ent_generator(int n) {
     hashtbl_entities[12].onDeath = NULL;
 
     hashtbl_entities[13].id = 13;
-    hashtbl_entities[13].tex = 7;
+    hashtbl_entities[13].tex = 12;
     hashtbl_entities[13].tex2 = 9;
     hashtbl_entities[13].name = "mathBlock";
     hashtbl_entities[13].updatePos = &math_block;
@@ -619,6 +619,12 @@ void parse_one_room(int id, char* filename) {
             pool[id].area->ents[k]->metai1 = defaultState;
             pool[id].area->ents[k]->metad1 = 0.0;
             pool[id].area->ents[k]->metad2 = activeTime;
+
+            if(defaultState == 0) {
+                pool[id].area->ents[k]->tex2 = 8;
+            } else {
+                pool[id].area->ents[k]->tex2 = 9;
+            }
         } else {
             pool[id].area->ents[k]->metai3 = 0;
         }
diff --git a/src/main.c b/src/main.c
index 47af833..6ca5e7b 100644
--- a/src/main.c
+++ b/src/main.c
@@ -9,6 +9,7 @@
 #include <time.h>
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
+#include <sys/time.h>
 
 #ifndef STB_IMAGE_IMPLEMENTATION
 #define STB_IMAGE_IMPLEMENTATION
@@ -523,6 +524,7 @@ int main_alt() {
     generate_texture_2D(9, "res/sq_dotted.png", PNG);
     generate_texture_2D(10, "res/button_on.png", PNG);
     generate_texture_2D(11, "res/button_off.jpg", JPG);
+    generate_texture_2D(12, "res/pi.png", PNG);
 
     printf("-----------------------------------------------------------------------------------------------\n"); fflush(stdout);
 
@@ -595,6 +597,7 @@ int main_alt() {
 
     int fps = 90;
     int interval = 1000000/fps;
+    float interval_s = 1.0f/fps;
     double slp_time = 1.0/fps;
 
     float delta = 0.0f;
@@ -604,16 +607,19 @@ int main_alt() {
 
     int count = 0;
 
-    clock_t finish = clock();
-    clock_t origin = clock();
+    struct timeval ogn, fnn;
+    gettimeofday(&ogn, NULL);
+    gettimeofday(&fnn, NULL);
 
     loc_tex = glGetUniformLocation(shaderProgram, "tex0");
     glUseProgram(shaderProgram);
     glUniform1i(loc_tex, 0);
 
     mathSignal = true;
+    float calc_T = 0.0f;
 
     while(!glfwWindowShouldClose(window) && player_hp > 0) {
+        gettimeofday(&ogn, NULL);
         // input
         // -----
         glClearColor(0.05f, 0.05f, 0.05f, 1.0f);
@@ -679,9 +685,10 @@ int main_alt() {
             }
         }
 
-        finish = clock();
-        usleep(max(0, interval-(int)(1000000*delta)));
-        sim_time += deltad;
+        gettimeofday(&fnn, NULL);
+        calc_T = (float)((fnn.tv_sec-ogn.tv_sec + (fnn.tv_usec-ogn.tv_usec)/1000000.0f));
+        usleep(max(0, interval-(int)(1000000*calc_T)));
+        sim_time += interval_s + maxd(0.0, (double)(interval_s-(calc_T)));
 
         // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
         glfwSwapBuffers(window);
@@ -692,12 +699,11 @@ int main_alt() {
             lastDmg = player_hp;
             dmgCD = 0.5f;
         }
-        delta = (float)slp_time;//+((float)finish - (float)origin)/CLOCKS_PER_SEC;
-        deltad = slp_time;//+((double)finish - (double)origin)/CLOCKS_PER_SEC;
+        delta = (float)(interval_s + maxf(0.0f, interval_s-(calc_T)));
+        deltad = (double)delta;
         if(count%(fps/10)==0) {
-            real_T = ((float)finish - (float)origin)/CLOCKS_PER_SEC;
+            real_T = (float)((fnn.tv_sec-ogn.tv_sec + (fnn.tv_usec-ogn.tv_usec)/1000000.0f));
         }
-        origin = clock();
         incr = 0.0f;
 
         count++;
diff --git a/src/move.c b/src/move.c
index 3ef35ef..2b31ec4 100644
--- a/src/move.c
+++ b/src/move.c
@@ -23,7 +23,7 @@ double speed = 6.0;
 double vtmult = 2.25;
 double min_dist = 0.4;
 double friction = 0.3;
-double gravity_factor = 25.0;
+double gravity_factor = 26.0;
 // ---------------------------------------------------------------------------------------------------- //
 
 bool is_clipping = false;