There are a lot of hidden games on steam, they dont have a store page, the only way you can install them is using their link
These games will not give you XP or Add games to your profile, they are just an interesting Easter egg that you can mess around with :)
There are a lot of demo links that dont work here, so i excluded them.
Arma 2 Free
steam://install/107400
CodeName Gordon
steam://install/92
SpaceWar
steam://install/480
BattleForge (This one was a demo, then they moved it to f2p, store page is not available)
steam://install/24770
Demo Games that are not demo games (they have a store page, they marked them as demos by mistake when putting the game up on steam)
Between
http://store.steampowered.com/app/29140/
COIL
http://store.steampowered.com/app/31500/
Mightier
http://store.steampowered.com/app/29150/
- If i made a mistake, or missed some game, just leave a comment :) i will edit the post
