My friend and I made up games like Fox Blaster, where we stand at opposite sides of the field and see who can rack up 100 percent first on your opponent. And Just Rest, where the only move available is rest, 5 stock. Then there's a clone of Just Rest with the same basic concept, just with Villager, and you can also you the Axe as a Melee weapon.
These mode don't work without another player, but I like to try to only meteor bots for kills sometimes. It's not really as fun as the other games, though.