Puyo Puyo 1 & 2 is often forgotten
Aero Blasters is not only 2 player, but when two people are playing there are 2-player only attacks. If both players charge the screen flash ability and release at the exact same time it becomes incredibly powerful. If both players are charged, they can alternately hit the attack button at the same time to cause energy to blast between the two ships that does major damage to anything between them. It adds so much to the game to play it that way, because then you start to look for opportunities to use the cool new abilities, even when they probably wouldn't help.