Space Invaders
Blast alien formations from low orbit to defend Earth in this classic shooter.
22 plays
aadam_uddin made this on Mable.
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About Space Invaders
Command a plasma cannon in low orbit to blast a formation of 32 incoming alien hostiles before they breach your defense perimeter.
How to play
- Move your ship left and right across the screen to line up your plasma cannon shots.
- Fire your weapon upward to destroy the 32 alien hostiles arranged in four rows of eight.
- Eliminate enemies on the far left and right edges first to delay the formation from dropping.
- Prevent any surviving alien from descending past the defense perimeter line to avoid an immediate loss.
Controls
- Touch
- Tap the on-screen left and right arrows to move, and the fire button to shoot.
- Keyboard
- Press the Left and Right Arrow keys to move, and the Spacebar to fire.
- Mouse
- Click the on-screen arrow buttons to move your ship and the fire button to shoot.
More about this game
Your goal is to destroy a grid of 32 alien hostiles before they descend to the defense line at the bottom of the screen. You control a ship moving horizontally at 310 pixels per second, firing plasma blasts upward. The alien formation moves side to side at 70 pixels per second, dropping exactly 18 pixels lower each time they hit the screen edge. You earn 10 points for each hostile destroyed. A run ends in victory if you clear all 32 enemies, or defeat if any alien reaches the perimeter.
Tips
- The alien formation drops 18 pixels lower every time it hits the screen edge, so focus on destroying the outer columns first to slow their descent.
- You can have up to 24 plasma bullets active on the screen at once traveling at 660 pixels per second, so keep firing rapidly.
- Your ship is restricted between horizontal positions 57 and 447, meaning you cannot hide completely off-screen to avoid the incoming alien grid.
FAQ
- How many points do I get for destroying an alien?
- You earn exactly 10 points for every alien hostile you destroy. Since there are 32 enemies in the formation, a perfect victory will result in a maximum score of 320 points.
- How do I lose the game?
- You lose immediately if any of the alien hostiles reach the defense perimeter line at the bottom of the screen. The aliens drop lower every time they touch the side edges.
- How many aliens are there in the formation?
- There are exactly 32 alien hostiles in the formation, arranged in a grid of eight columns and four rows. You must destroy all of them to secure a sector clear.
