This week both Nintendo and Microsoft's downloadable game services have some great titles to offer. The Wii will soon be playing host to Super Mario Bros. 2, Ecco: Tides of Time, and Dragon Spirit . Xbox Live Arcade, meanwhile, has up an update of Missile Command . This latest follows on the heels of Pac-Man: CE , a worthy and well-received updating of the arcade classic. Ars' comment about Ecco is dead on: "I used to love this game, just swimming around and doing those flips out of the water as Ecco was pretty calming. Then you tried to actually play the game and found out just how excruciatingly difficult it could be. While the Dreamcast update lost some of the magic, the original Ecco is still a neat twist on 2D games. Who knew that taking a platformer and setting it underwater would be so much fun?"