Harbor Control… sorry, Harbor Master is the latest game from Imangi studios and is clearly the heavily influenced output of some real Flight Control fans. Or some real fans of money. Regardless it is genius. To call it a rip off would be unfair. After GTA III came out the next few IPs to feature a sandbox environment were all branded GTA clones but eventually the sandbox became a genre all of its own. Perhaps Firemint's immensely popular Flight Control has unwittingly created its own genre too.