Simon Tatham's Portable Puzzles

Available on pretty much every Linux distro as a package from the repository, Simon Tatham's Puzzle Collection is all anyone needs to stay busy for the rest of their lives. (Well, that and TIS-100. And Tomb Raider. And Kerbal Space Program. And ...)

Looks like there is an android port. Now I may be sitting on the porcelain throne until my phone's battery dies.