Drachen

Drachen is derived from an old Chinese game. 144 tiles are arranged on 5 levels on the playing surface. The goal is to remove all tiles. To do this, two matching tiles may be removed, provided that each of them is free to move either to its left or right [i.e. no other tile "obstructs" the movement of each matching tile]. 34 different types of tiles are available in sets of 4. An exception is provided by BAM(boo), MUM, ORC(hid) and PLUM and similarly by SPR(ing), SUM(mer), AUT(umn) and WIN(ter). Tiles from
these sets may be matched with another tile from the same set and removed. The only help allowed is "Show move". After all other types of help, it is no longer possible to achieve a better time in the current game.