XKOBO is a game for X. The play is quite simple. Your object is to
destroy all the fortresses. You can control your ship by pressing
the cursor keys, and shot beams by pressing the SHIFT key or the
left mouse button.

XKOBO is Copyright (C) 1995 Akira Higuchi <a-higuti@math.hokudai.ac.jp>.

The program is available under the GNU GPL.