Thank you for trying it!
Error Ware 2 can be played with 1-4 players locally. The Taxi mode is primary for multiplayer but you can change the number of players to 1 there, too.
The game is inspired by the Wario Ware series by NIntendo, where you have only 5-10 seconds or so to complete a random mini game. You only get a clue at the beginning of the game, usually a simple task like "GRAB!", "SPIN!", "DEFEAT", etc. Then you have to figure out how to win the minigame by doing what the clue says.
I hope that was helpful!