I made it to the Sand Castle in Bug Fables. I found a second key, but I can't find a door to use it on, so I'll take that as a sign to take a break.
So far, I'm finding that the medal that you get for beating three bosses in the boss rush mode to be a huge help. Not only does the difficulty not matter in that mode (meaning that I can unequip the Hard Mode badge to make the fight easier), but the medal makes Spying a free action, so I don't have to do the minigame beforehand and I can act with that character afterwards.
I'm either going to play Halo 1 (I left off at the start of mission 3) or Kingdom Hearts 2 (I left off at Hollow Bastion) since I've got the afternoon off. This will be my first time playing through either of those games.