The purpose of the game is to remove all the tiles. Click a tile to remove it and any vertically or horizontally adjoining tiles of the same color. (So, clicking a tile with no neighbours of the same color does nothing.) The more tiles that are removed in one go, the bigger the score.
There are also (unmaintained) desktop versions written in various languages: D/Gtk, Nim/NiGui, Rust/FLTK, Tcl/Tk 8.6, Tcl/Tk 9, (the version I use), and C++/wxWidgets.
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