What do you call games thar are exclusive to a certain game system?

Question

I've heard they are called platformers but I am not sure.

Answer 1

'Exclusives', that's all.
'platformers' are a genre of game, such as Mario or Sonic, where you jump on platforms as part of the game.

Answer 2

your wrong, "platformers" is just a genre of game, like "first person shooter" etc (a video game is generally considered a platformer when it consists of levels and "platforms" that the player jumps from in order to suceed, mario and sonic being made famous via the platform genre)

games that are exclusive for a system are just usually refered to as being "exclusive to x console"