You can use multiple codes per account.
This code will give you possibility to buy some in-game items on Gameforge.
Once the code is validated, your account will receive the appropriate number of rubies / credits / ambrosia, etc. Below you can see the list of games and the number of coins / credits / ruby etc. received: Tera, Metin2, 4Story, AirRivals, BattleKnight, Gladiatus, Ikariam, Katsuro, Bitefight, Darkpirates, Kingsage, Metaldamage, Ogame, WarpFire and other games from Gameforge.