In world of genesis game, money zen cash is the main currency that you can get either through the battle or purchasing for various amounts in iap store
By having enough zen, you can unlock campaign packages and get few modes in skirmish mode
There will be 4 different campaigns available for 300 “zen” each in that they start you off with 550 zen int he beginning of the game.
Once getting zen, you have to purchase a few maps for skirmish mode.
This game is a kind of RTS game that offers single-player campaign and multiplayer online options.
Thus you will be allowed to choose to play one of three unique races in which each race has different buildings, units and upgrades.
Afterward, you will be able to send your skilled units to fight with enigmatic dragons and monsters, robots and Hi-tech machines or sci-fi alien units.
In addition, after purchasing the first single player level you will get enough credit for further play
Moreover, you can earn other credits by playing this game online to get more single player levels or you can use the cash to get more credit to level up your race