Diviper

Number-merging snake puzzle

Diviper is a PC number-merging puzzle game about a little snake that eats numbers and adds them to the end of its tail. When two matching numbers touch, they merge into one worth twice as much. Your job is to choose the next number carefully and arrange the tail so its blocks combine: for example, a line of 16, 8, 4 and 2 can roll up into 32 after you collect another 2.

There are no timers or enemies. You can take your time, but the tail keeps growing, and the run ends if it boxes the snake in.