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Please update to 2.3+ version. I catch some bug...https://disk.yandex.ru/i/hIS0fg1_bBKJcw

Thank you! I will look into it.

So, I can't seem to reproduce this on my end.  All you did was convert it to 2.3 and it just doesn't work?  What platform are you running this on?

Yes. v2.3.4.583

Well, I rewrote like the whole demo.  Try the latest upload.

TDMC.yyz

Script: movement_and_collision at line 8 : unexpected symbol "?" in expression

Script: movement_and_collision at line 8 : got '?' expected ':'

I apologize for my stupidity...

I'm afraid to break something in the script

(+1)

Update to the latest version of GM
Line 8 uses the ?? operator or "nullish" operator.  It's the equivalent of:
if(_count != undefined)
  _count = _count
else
  _count = 1