I've got Monaco, Reus, and 2 copies of Monster Loves You! Would you take those as the collateral in place of 10 keys and then you give back the rest and keep one when I give 3 copies of Terraria to you after opening the 4-pack?
Choose 1 gift for Terraria:
Serious Sam 2
McPixel
DLC Quest
The Binding of Isaac
World of Goo
Just Cause
Choose 1 gift for 2x Terraria:
Sid Meier's Civilization V
Resident Evil 5
BioShock
Bioshock 2
Guns of Icarus Online Collectors Edition
Super Meat Boy
Garry's Mod
Titan Quest Gold
Red Faction Guerrilla
Postal 2 Complete
Just Cause 2
Renegade Ops
Half-Life 2
Rock of Ages
Forge - Starter Pack
Syberia Bundle
Audiosurf
Bastion
Magicka
Choose 1 gift for 3x Terraria:
Deus Ex: Human Revolution
Castle Crashers
Two Worlds II
Dead Island GoTY
Super Street Fighter IV Arcade Edition
Serious Sam 3
Sonic & All-Stars Racing Transformed
Dead Rising 2
Dead Space 2
Fallout Collection
Trine 2: Complete Story
Command & Conquer: Red Alert 3
GRID
Killing Floor
I'm looking for someone to open a 4 pack of terraria for me.
How this trade happens -
You trade me 2.5 keys and I trade you my 4 pack.
You open the 4 pack.
You trade me back the 3 copies and I return you 2 keys.