There's currently very few games due to the recent release of this calc.
But you have some games here :
http://www.ticalc.org/pub/84pluscse/asm/games/
(phoenix, tetris...)
And flash games for ti84 plus c se here :
http://www.ticalc.org/pub/84pluscse/flash/games/
(buttonz, frogger, tunnel)
And some basic games for ti 84 plus c se here :
http://www.ticalc.org/pub/84pluscse/basic/games/
(tic tac toe, checkers, mastermind)
enjoy !