Space Invaders

Overview

A wall of fifty-five aliens marches left, hits the edge, drops a row, and reverses toward the other side, edging closer to the ground with every pass. That single rule, inherited from the 1978 Taito original, is what makes Space Invaders so tense: the formation never stops, and the lower it gets, the less room you have to react. Three alien types fill the ranks, each worth a different score, and they fire downward as you fire up.

Between you and them stand destructible pixel shields that erode shot by shot, yours and theirs, until a worn shield becomes worse than no shield at all. A mystery UFO occasionally streaks across the top of the screen for a fat bonus, rewarding players who keep one eye on the ceiling instead of just the rows in front of them. Each cleared wave reforms and comes back faster, so the real opponent is the pace at which the formation compresses against the bottom of the playfield.

How to Play

Move left and right with the Left and Right arrow keys and fire straight up with Space. You can only have one bullet on screen at a time, so timing the shot matters as much as aiming it. On touch devices, on-screen Left, Right, and Fire buttons replicate the keyboard controls. Duck behind the shields when the alien fire gets heavy, but remember that your own shots also chew through them. Pause to plan a burst across a row rather than firing randomly, because a wasted shot leaves you defenseless for the half-second it takes to reload.

Tips & Strategy

Pick off the outer columns first so the formation has farther to travel before it turns, which slows its overall descent and buys you breathing room. Clearing one side completely can leave the remaining aliens marching a long distance before they reverse, a classic trick for buying time.

Watch the top of the screen and keep a shot ready for the mystery UFO, since the bonus it drops can outweigh a full row of regular aliens. Preserve your shields by not firing through them unnecessarily; a shield with a clean gap is more useful than one riddled with your own holes. As the wave thins out, the remaining aliens fire less often but descend faster, so position yourself under the last few columns and end the wave cleanly before it reforms at higher speed.