2. A sumo-vacuum-cleaner-bot-game. Imagine a fairly large table divided into two sides, with two Roomba-style robots. Each 'bot has to clean up the marbles on its own side first, or you can push your opponents' marbles off the table to keep them from scoring (if they touch you while you're on their side, you have to respawn on your side after five seconds), BUT the marbles can be put into a launcher at the far end of their side of the table (you have to clean up the left side = far left side has launcher) to knock your opponent off the table instead! +1 point/marble, -1 point/launched marble, +50 for a successful 'bot knock-off, the 'bots respawn (or get lives) after being knocked off. Analog stick to run around, some sort of button to turn on/off vacuum (otherwise you just push marbles out of your way), some other button while at your end (not side, but END) of the table to control launcher. You may only control one at a time.
3. A 2D multiplayer platformer arena game, where each player attempts to collect all of the dots, fruit, money, etc. BUT each player gets to do ONE action to the arena every 15 seconds. That action is changed between rounds, randomized between players. Example: Player 1 gets "Shove arena left" for round 1, and activates it, causing their opponent to miss a platform and fall to their death (and respawn of course). 15 seconds later, they get "Shove arena left" again and have the opportunity to use it. Round 2 begins, and Player 1 gets "Flip!", for which the 2D arena literally flips (arenas should have platforms all over the place) and leaves Player 2 to fall into a pit. Round 3, and Player 1 gets "Rotate Left 90", allowing them to rotate the entire level 90 degrees to the left. Etc.
4. IDK, something along the lines of Portal 2 in the way of being able to solve complicated puzzles with a friend? Buttons, switches, timers, lava, water flowing, etc...haven't thought this one out yet...
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