Trine and Trine 2 are currently 75% off on Steam.
http://store.steampowered.com/sale/TrineWeekend
Trine/2 are beautiful side-scrolling, puzzle-platformers that feature 3-player Co-op (local and online) and three character classes to play. I own both of them already (though not the Goblin Menace DLC for Trine 2), and Jalek owns them both as well.
Sign up to Steam, buy them and join the NOR Steam group to play with us.
Here are the system requirements:
PC System Requirements
OS: Windows 7 / Vista / XP
Processor: 2.0 GHz CPU (Dual Core recommended)
Memory: 1 GB
Hard Disk Space: 1.5 GB
Video Card: ATi Radeon HD 2400 or NVIDIA GeForce 7600 or better (Shader Model 3.0 needs to be supported)
DirectX®: 9.0c
Sound: DirectX 9.0c compatible
Additional: *Please note that Trine 2 may not run on most Intel graphics solutions used in 2004-2009. The game does run on new (2010-) Intel HD Graphics 3000 or better.
Mac System Requirements
OS: OS X version Snow Leopard 10.6, or later.
Processor: Intel Mac
Memory: 1 GB RAM
Hard Disk Space: 1.5 GB
Video Card: NVIDIA GeForce 8600M or better / ATi Radeon 2400 or better*
*NOTE: Please be advised that Trine 2 does not run on Intel graphics solutions used in 2006-2008. The game does run on new (2010-) Intel HD Graphics 3000 or better. Macs with NVIDIA GeForce 9400M or ATi Radeon X1600 may not achieve smooth gameplay.
Additional: Keyboard, Mouse/Trackpad with Secondary click enabled