Dungeon Defenders thinks with pre-order portals

Trendy Entertainment will be making use of some Valve properties for a couple of pre-order bonuses with the Steam version of Dungeon Defenders.
Exclusive to the pre-ordered Steam copy is the in-game Aperture Science Handheld Portal Device (pictured below), along with some Team Fortress 2-themed ‘familiars’ to help you hold your dungeon against the encroaching hordes.
Dungeon Defenders is due for release later this month, on PC, Xbox 360 (Xbox Live) and PS3 (PlayStation Network).
Source: store.steampowered.com