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Release Version 0.6 [17/1/2003]
        - The joystick was supported.
	- A device uses /dev/js0.
	- Allotment of a button is performed on a setting screen.
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Release Version 0.5 [19/2/2002]
	- The special attack was canceled and the charge shot was added.
	- A charge shot can be discharged by pushing a key, when the gauge currently displayed on the bottom of a screen collects.
	- If a charge shot hits an enemy, a blast will be released on that spot and a damage will be given to the enemy of a blast within the limits.
	- Moreover, chain explosion occurs and a damage can be given to a wide range enemy.
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Release Version 0.4 [13/2/2002]
	- The stage 4 was added.
	- When the level of the main and asub took the same item at the time of the maximum, it was made to deliver a special attack.
	- It stops having eliminated, when a superficium was destroyed and the destroyed picture was displayed.
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Release Version 0.3 [24/12/2001]
	- The stage 3 was added.
	- When a boss was beaten, the bug into which mark did not go was corrected.
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Release Version 0.2 [17/12/2001]
	- It corresponded to FHS.
	- data file is installed in /usr/games/ and score file is installed in /var/games/.
	- The background drawing of a stage 1 was changed.
	- The stage 2 was added.
	- The sub weapon was adjusted.
	- The sub weapon was added.
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Release Version 0.1 [25/11/2001]
	- first (pre)release version