Best game to buy under 5 € this last day of summer sale ?

Assassins Creed 3? Are you trolling or something?

assasin creed 3
but if its doesnt cost under 5 euro,buy gta 4 or buy terarria/wolfenstein 3d

brothers is my list, would leave a change for another game (payday).
but if you must i would pick batman, for the story cuz i dont think its multiplayer is alive

Bad Company 2. Becouse of a multiplayer. You will probably spend most time with this game.

well personally i would go with witcher 2, but if it has to be one from your list then gta

Payday 1 is good only and only if you play it with friends... the queue system and the way that the game joined players to an ongoing match is awful...
At least that is my opinion, , check battleblock theater or don´t starve

If you don't mind a bit of self promoting, our 100% Orange Juice is a boardgame with 4 player online multiplayer. It made us very happy by achieving a place in the top 100 best selling games of the $5 category without being featured in any of the promotions of this Steam Summer Sale..

Some may not be multi but here goes:
-Double Dragon Neon
-BloodRayne Betrayal
-Witcher 1 and 2
-Borderlands 2
-Chivalry
-Ikaruga
-Cloudbuilt
-Metro 2033
-Fallout NV
-Limbo
-Trine (best to get the complete package, read that there is a beta patch to enable multi on part 1)
-Awesomenauts (if you're into that)