Is your screen slanted? On some of the newer TI-83+ Silver Edition, TI-84+, and TI-84+ Silver Edition calculators the screens are cheaper and will cause problems with some games. Run this program from Mirage OS or using Asm(prgmALCDFIX) on the homescreen every time you reset your RAM, and the problem should be fixed. NOT for regular TI-83+ calculators.