This is a repost of the original at: <a href="http://www.lizengland.com/blog/2014/04/the-door-problem/" rel="nofollow">http://www.lizengland.com/blog/2014/04/the-door-problem/</a>
I made a top-down 2D survival horror game with doors that could be opened, closed, locked, unlocked, and peeked through. Zombies could open them when unlocked. Sincerely hope to never make a game with doors that aren’t proximity activated in the future!