There are no opponents, no announcers, and no cheerleaders. Just you, a ball, some old-school music and a scoreboard. Sounds boring, right? Except Underground Basketball is actually ridiculously fun and addictive. The iPad-only game tasks you with making as many shots as you can using a simple trajectory meter in a two-minute span. Good luck beating your newly set top score. Therein lies the addictive part we told you about.