I had the same problem on my puppy-slacko 5.7

Solution was quite simple: i just change keyboard layout from WinKeys to International (with dead keys). Maybe this will be useful for someone.

Hi guys! I had tried to install ninja IDE on my slacko-puppy 5.7 by means of PPM. It finds the packages, dependencies and install them quite correctly. Ninja appeared in the Menu. But when I try to launch it by clicking nothing happens. Whats wrong?

This is the best game ever!
Spent my childhood playing in it with my schoolmates.
Great thanks to koulaxizis!