ArrowFloor can crash the gba

[city41]

A level with ArrowFloor and just one other, non cell based, object, can cause the gba to crash.

repro:

1. create a level with ArrowFloor tiles and a single Arrow sign
2. run the game

crash

3. now just add a brick or some other object to the level, leaving both arrow floor and sign in place

no longer crashes

Looking at Castle Dash, it looks like arrow floor is being used correctly in Smaghetti. I think this is likely a bug in SMA4 itself.

low priority

playing with this more, it seems like the crash only happens if arrow floor and one non tile based object is in the level. Once you add just one more object, the crash goes away. Levels that will legit be made up of just arrow floor and one thing are going to be extremely rare. Even just having arrow floor plus two arrow signs avoids the crash.