Hex is a 2 player board game invented by Piet Hein and John Nash. For the rules of Hex see Wikipedia -> http://en.wikipedia.org/wiki/Hex_(board_game) Read more about Hex v1.0 (Wii Game)
What you have to do is get the whole screen one color. Red or blue, it doesn't matter. However, its not as easy as it sounds, when you select a tile, all tiles around flip to the other color as well as the selected. Read more about IDKWTFTPIC (19-05-2009) (PSP Game)
Five is a version of Gomoku (sometimes called Gobang). Players take turns placing tokens on the board. The first player to place five tokens in a horizontal, vertical or diagonal row wins. Read more about Five v1.0 (iPhone Game)
There are many other Binary Clocks available but do you find yourself somewhat perturbed by the fact these clocks aren't truly binary? They may look binary and count up in binary but they still have decimal digits and only represent those digits in binary not the whole thing. Read more about True Binary Clock v1.0 (Android Application)