There are 5 game modes in rocket league.
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Soccar is the number 1 game mode, it has a ball that you try to score with. It features 1v1's, 2v2's, 3v3's, and 4v4's.
Snow day is were there is a hockey puck and you try to score on the opponents goal.
Hoops is a basketball game mode were you try andscore it above the net.
Rumble is a powerup game mode. The powerups are, Magnitizer, The Boot, Haymaker, Tornado, Grappling Hook, Power Hitter, Disrupter, Plunger, Spike, Freezer, and Swapper.
Dropshot is a hexagon arena were there are tiles on the ground and once the ball hits one tile twice you can score there.