Following a light week, Microsoft returns this Wednesday to the two game new/old format, dropping Hexic 2 (800 Microsoft Points) and the Sega classic Ecco the Dolphin (400 Microsoft Points). Hexic 2 comes from famed Tetris creator Alexy Patjitnov and follows up the packed-in original XBLA title and adds new modes including same-screen or Live multiplayer; Ecco the Dolphin boasts enhanced graphics and sound plus a “Best Time” leaderboard.

These games join more than 75 others on the service which has been a huge success for Microsoft as detailed in a lecture by Marc Whitten this week at GameFest, where he discussed the company’s plan for attracting the casual gamer to the XBox 360. Whitten stated that they’ve seen a 156% average financial return in the past year on XBLA titles, earning more than $30 million to date. Based on this success they expect revenue on XBox Live Arcade to double in the next fiscal year and predict that by the end of this year they will have reached 45 million downloads of over 100 available titles.

On Nintendo’s similar download service, Virtual Console, they’re dropping three new games this week including the original NES classic Metroid (500 Wii Points), plus the Sega dungeon crawler Shining in the Darkness (800 Wii Points) as well as the TurbGrafx-16 game Cratermaze (600 Wii Points). Nintendo is choosing now to push the original Metroid title onto the VC as a means of keeping their Metroid brand fresh in gamers’ minds as they prepare to release the marquee Wii game Metroid Prime 3: Corruption in two weeks. As part of this effort, next week’s VC title is expected to be the SNES sequel, Super Metroid.