If it was me, I would have each microgame as it's own layout. Then maybe an in-between layout that moves to the next game, sort of like a level select map you've probably seen in a lot of mobile games. Or, have it load directly into the next microgame/layout after the one the player is currently on is completed. I've not played Warioware, so I'm not sure how the gameplay mechanics/sequencing actually flows in-game.