diff --git a/data/game.lua b/data/game.lua
index c0991e1..607a15a 100644
--- a/data/game.lua
+++ b/data/game.lua
@@ -22,7 +22,7 @@ function normal_update()
         quit()
     end
 
-    if btnp(KEY_F2) then
+    if btnp(KEY_F2) or mbtnp(1) then
         local val = zoom() + 2
         if val >= 10 then val = 2 end
         zoom(val)
diff --git a/lua.cpp b/lua.cpp
index f5db39d..afe088b 100644
--- a/lua.cpp
+++ b/lua.cpp
@@ -496,6 +496,12 @@ extern "C" {
         return 1;
     }
 
+    static int cpp_mbtnp(lua_State *L) {
+        uint8_t i = luaL_checkinteger(L, 1);
+        lua_pushboolean(L, mbtnp(i));
+        return 1;
+    }
+
     static int cpp_time(lua_State *L) {
         lua_pushnumber(L, time());
         return 1;
@@ -833,6 +839,7 @@ void push_lua_funcs() {
     lua_pushcfunction(L,cpp_mousey);    lua_setglobal(L, "mousey");
     lua_pushcfunction(L,cpp_mwheel);    lua_setglobal(L, "mwheel");
     lua_pushcfunction(L,cpp_mbtn);      lua_setglobal(L, "mbtn");
+    lua_pushcfunction(L,cpp_mbtnp);      lua_setglobal(L, "mbtnp");
 
     lua_pushcfunction(L,cpp_time);      lua_setglobal(L, "time");
     lua_pushcfunction(L,cpp_abs);       lua_setglobal(L, "abs");
diff --git a/mini.cpp b/mini.cpp
index 68ec0c5..af1f27d 100644
--- a/mini.cpp
+++ b/mini.cpp
@@ -79,6 +79,7 @@ Uint8 key_just_pressed = 0;
 
 int mouse_x, mouse_y, mouse_wheel;
 Uint32 mouse_buttons;
+uint8_t mouse_just_pressed = 0;
 
 SDL_GameController *gamepad = NULL;
 int8_t pad_just_pressed = SDL_CONTROLLER_BUTTON_INVALID;
@@ -274,6 +275,7 @@ int main(int argc,char*argv[]){
         Uint32 dt=SDL_GetTicks();
         key_just_pressed = 0;
         pad_just_pressed = SDL_CONTROLLER_BUTTON_INVALID;
+        mouse_just_pressed = 0;
         while(!should_exit) {
             mouse_wheel = 0;
             while(SDL_PollEvent(&mini_eve)) {
@@ -311,6 +313,9 @@ int main(int argc,char*argv[]){
                     key_just_pressed = mini_eve.key.keysym.scancode;
 #endif
                 }
+                if (mini_eve.type == SDL_MOUSEBUTTONUP) {
+                    mouse_just_pressed = mini_eve.button.button;
+                }
                 if (mini_eve.type == SDL_MOUSEWHEEL) {
                     mouse_wheel = mini_eve.wheel.y;
                 }
@@ -330,6 +335,7 @@ int main(int argc,char*argv[]){
                     loop();
                 }
                 key_just_pressed = 0;
+                mouse_just_pressed = 0;
                 pad_just_pressed = SDL_CONTROLLER_BUTTON_INVALID;
             }
             SDL_LockTexture(mini_bak, NULL, (void**)&pixels, &pitch);
@@ -929,6 +935,10 @@ bool mbtn(uint8_t i) {
     return mouse_buttons & SDL_BUTTON(i);
 }
 
+bool mbtnp(uint8_t i) {
+    return mouse_just_pressed == i;
+}
+
 float time() {
     return float(SDL_GetTicks())/1000.0f;
 }
diff --git a/mini.h b/mini.h
index 5c0e26b..2451e74 100644
--- a/mini.h
+++ b/mini.h
@@ -212,6 +212,7 @@ int mousex();
 int mousey();
 int mwheel();
 bool mbtn(uint8_t i);
+bool mbtnp(uint8_t i);
 
 float time();