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Then get people to pay for "gems" which "speed up" construction.

Then this turns into Clash of Clans. =)

Even better, restrict algorithms to certain amount of CPU time. If you want to do more advanced stuff you can buy more computational time per cycle.

Haha if we wanted to get acquired by EA, I'm pretty sure that's a good strategy...

"CodeCombat II: Dungeon Keeper" LOL