First of all, the praise, a BIG praise, your TIC-80 is amazing, well done :) The bug(?) happens when I try the demos with the 64 bit linux version (I use Ubuntu Mate 16.04.2 64-bit) of the editor. It acts like the up and left arrows are always pressed, it is very strange because the others carts run just fine. Other than that, thanks for your work, I hope you sincerely the best and long live TIC-80!