One more to throw in before you start the weekend. Derek of Epic Applications just released a great app called Brain Teaser and was kind enough to give us 50 free copies. Brain Teaser lets you test your mind with various math problems. A great way to stay sharp while you're on the go or just killing time at your desk. You can play multiple game lengths, store high scores and never experience the same game twice. Brain Teaser works on devices running OS 4.6 and higher and is on sale for just $0.99 through Sunday. Just leave a comment on this post to be entered for one of 50 free copies. Only leave one post - multiple submissions won't count. Contest ends this Sunday at Midnight PST.