We're running a Game Jam over at Develteam, with prizes awarded to the top 3 games.
The Challenge Requirement is "Dual Mode Retro"
To meet the challenge, your submitted game must be either 2D or 2.5D and feature two distinct modes of game play. Games that would meet the challenge would be Zelda 2, TMNT, Blaster Master, Actraiser, and The Guardian Legend.
Prizes include a total of 9 games for 1st place, and 5 games for 2nd and 3rd place each.Games can be developed solo or in teams of any size.
Prizes are split among each member of the team, and the team decides how this split is done.
For more information, including a clarification on the challenge and rules, visit the Game Jam Page.