Kevin HY Hau - Hello World 👋

How to play: aliens march across and drop lower each time they reach the edge. Shoot them all before they land, and dodge their shots. Your four bunkers wear away when shot. The saucer on top is worth bonus points and always drops a weapon. Move ← → or A / D (or drag on the screen), fire Space (hold it) or the FIRE button, P pauses. Classic has big blocky aliens, steps like the arcade original with a CRT look, and lets you have one shot in the air at a time. New style has a swarm of tiny aliens (75% smaller; there is a setting for 50%), smooth movement, glow and rapid fire. When you hit an alien it may drop a capsule: L tri-laser (3 beams: straight and 30° each side, they pierce and bounce), B bomb (big blast), H 3 homing missiles, R rocket (fast, blast on impact), F rapid fire, S shield, Z freeze the aliens, + extra life. Weapons run out of ammo and go back to the normal gun. Weapon drops are only in New style; Classic is plain shooting, so its aliens speed up gently. Now and then an alien dives out of the formation and swoops at you (shoot it for double points, or dodge it); a dim saucer also drifts across the background, just for show.