While you are looking for HTML5 over an app, in app-land, there are the DragonBox games. Very, very well done. My kids loved those games. As far as other games

While you are looking for HTML5 over an app, in app-land, there are the DragonBox games. Very, very well done. My kids loved those games. As far as other games go that are free online, there are plenty of options. Check out Set, KenKen, Sudoku, Vertex, Tiles, and 2048.