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GMS 2.3+ Trying a platformer tutorial, game won't run

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I started doing this tutorial and managed to do everything up to 26: 36.

When I click play to test it, it won't run. The Output goes up to "Entering Main loop" and then nothing. The laptop gets to where I can hear the fans, which may not be a good sign, and I even took out the "Collide with wall" code and it still ran. Setting it to 30 FPS didn't work. I checked the code and it's right. Turning on Laptop mode didn’t work.
key_left = keyboard_check(vk_left);
key_right = keyboard_check(vk_right);
key_jump = keyboard_check_pressed(vk_space);
var move = key_right - key_left;

hsp = move * walksp;

x = x + hsp;

//colliding with wall
if !place_meeting(x+hsp,y,OBJ_Wall) {
    while (!place_meeting(x+sign(hsp),y,OBJ_Wall)){
        x = x + sign(hsp);
    hsp = 0;   
Is this an issue with my computer, or is it GMS? How do I fix this?

Simon Gust

You have a little error in the collision code, the first place_meeting() should not be negated with "!" because you actually want to check for a collision to collide and not the other way around.
Holy cow! That somehow managed to fix it. Again, it wasn’t opening the game up at all.

EDIT: Huh. Did a bit of testing and it seems that was exactly what was causing the problem. That was something I almost thought was the computer or the software.
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Forum Staff
If your game is stuck in an infinite loop, it will not be able to update what's displayed. If it gets stuck in said infinite loop before the window is created... it also won't be able to create the window. So whenever this happens, you can be almost certain that you have an infinite loop somewhere. ;)

There's a little trick to detect infinite loops:
var _loop_count = 0;
while (...)
    ... loop code ...
    if (_loop_count > 100000)
Your game will scream at you if you're stuck in an infinite loop. Now include a hint about where it is and you'll find it in no time.


Friendly Tyrant
Forum Staff
Please do not post errors or potential bugs on these forums until the 2.3.0 beta is fully public. There is a beta forum on the helpdesk for these things that should be used until everyone has access to the beta.
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