I've had Flow Free (from Big Duck Games) on my phone for a while and it's still as addictive as the first time I played. In fact my first time was playing on someone else's phone and I had to download it immediately. Simple though the beginning puzzles may be, when you find yourself stumped on a particular level and finally get though, you feel like a genius haha.
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Accidental Tech Podcast - Uncomfortable in My Pants