10 Completely Shameless Video Game Rip-Offs

10. Angry Birds - Crush The Castle

If you've ever worked a desk job, you'll know that free online games were something of a sanctuary on a slow day. Sites such as MiniClip and Yahoo Games were your greatest discoveries to get through the day without losing yourself to boredom.

One such online classic was a nifty physics-based game called 'Crush the Castle' which tasked you with throwing boulders at precariously balanced structures. If this doesn't sound familiar yet, imagine the boulders as colourful cartoon birds, add in a few pigs as targets and there you have it - rip off central.

As you progressed through CtC, you gained access to progressively more powerful boulders: bigger stones, boulders that split into three and even explosive rocks. Seriously, how has no-one spotted this before and sued the pants off the Angry Birds franchise?