If both of you hit the Z at the same time you switch positions. When you play cooperatively you and a friend take one cart with one of you driving and the other attacking opponents. You can play against or with friends in Double Dash. Multiplayer is fun, but should have been a lot more fun.

Unfortunately it won't be long until you've burned through all of the single player levels and you turn to the multiplayer mode to fill your time.

Each of the maps are themed around a different character in the game, my favorite is the Daisy Cruiser which has you racing through a cruise ship dodging coasting table and inviting swimming pools as you try to beat out your opponent. The tracks in Double Dash are just as fun as the original, going far to capture the essence of Nintendo play with colorful fully animated backgrounds that can actually reach out and grab you when you race by. When you push the Z button, or what I like to call the mini shoulder, your characters switch places. The extra character can also steal items when you start smacking into each other in a race. The way this works is that one character drives while the other hangs onto the back tossing things at your opponents with the push of a button. This also means that you can now hold two power-ups at a time. Each one has their own special power-ups, activated when you pick up power-up cubes during a race. When you start a game you get to pick two characters with which to race. The other major addition to Double Dash is the inclusion of a second character on each cart.

Mario kart arcade gp dx emu