Super Mario Bros. X Forums

i worked on one of my levels from "advanced adventure: another route" 2 days and this happened

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someone knows what to do when this appears while testing/playing level?

This can happen if you've used too many blocks, NPCs, or BGOs in your level. There are limits to how many you can use (I believe the debugger will tell you what those limits are, and it should warn you if you get too close to them), so the solution would be to find out which one you're using too many of and delete some.