🛸 Space Defender

How to play

A rotating turret sits on a base line at the bottom of the screen. Alien craft drop in from the top, drift sideways as they fall, and damage your shield if any reaches the base. You aim with the pointer and fire single shots. The run ends when the shield hits zero.

• Move the mouse over the canvas — the barrel turns to point at the cursor and keeps tracking wherever you last moved.
• Click on the canvas — fires one bullet along the current angle at 10 pixels per frame. There is no auto-fire.
• Start button — begins a run and resets shield, score and wave. It reads Restart during play.

Scoring

The common red craft falls at 1.5 pixels per frame, takes two hits and pays 10 points. The orange fast craft appears about three times in ten, falls at 3 pixels per frame, dies to one hit and pays 5. Reaching the base costs 10 shield for a red craft and 5 for a fast one, and nothing ever restores it. The wave counter rises every 300 frames, and each wave shortens the spawn interval by three frames down to a floor of 20.

Tips

• Shield never regenerates, so treat every leak as permanent. Ten red craft getting through is the whole run.
• Red craft need two hits and fall slowly, so start on them high, then pick off the fast orange ones in the gap.
• Shoot near the top. Bullets are deleted at the canvas edge, and a craft close to the base may land before your shot does.
• Fast craft are worth half as much but arrive twice as quickly, so late in a run killing the cheap ones is often right.

Frequently asked questions