I downloaded Open Arena and Nexuiz and played them. Now I realize that they are older, but they both played well. To get OpenArean 0.8.8 to play on Lion you need to set the .app folders to executable. Navigate to the folder that you unpacked the OpenArena archive, open a terminal and type the following. Code: chmod -R +x ./OpenArena* After that the game will play just fine. After playing the games, I actually heard the fan on the MBA spin up.