Brain Out 2

There's no sound, so you can play it outside, but since it involves shaking or tilting the phone, I don't recommend playing it while standing on a bus. There are about 500 games in total, but if you buckle down and play continuously, you could probably finish them all in a day. You can play without Wi-Fi. Using a hint once reveals the solution from start to finish. However, there are a few stages where the tilt or flip motion doesn't register. For those, you have to use the lightbulb item to skip, which is annoying. There's a matching game, and it has a separate item from the lightbulb. But besides that, the lightbulb is pretty much a universal item for other games. An ad pops up about once every 1-4 rounds. Retrying doesn't trigger ads, no matter how many times you do it.