Move the cannon
The cannon slides along the bottom row and fires straight up its column.
AsobiPlaza shooter puzzle
Alien Line Defense
Slide the cannon, shoot down the descending line.
The alien formation steps sideways on a fixed cadence, drops a row and reverses at the walls, and creeps toward your cannon. Line up each column, work past destructible shields, and clear the sector before it breaches the bottom row.
The H5 browser build is live with 10 starter stages and no account requirement.
H5 play ready
Read the formation
Aliens step on a fixed cadence, dropping and reversing at each wall.
Beat the shields
Destructible shields soak shots. Wear them down or shift columns to dodge.
Clear before breach
Destroy every alien before the line reaches your cannon row.
Deterministic fixed shooter
A fixed march, read and out-shot.
Alien Line Defense is integer-only and fully deterministic: no RNG, no clock. The formation's march is purely a function of how many steps it has taken, so you can plan exactly when to fire and when to slide the cannon over.
Game moments
Formation, shields, breach.
Final screenshots will be replaced from a release candidate build. For now, this page uses derived art that represents the mechanic honestly.
Formation start
An aligned line of aliens with shields below.
Stepping down
The line hits a wall, drops a row, and reverses.
Sector cleared
The last alien down leaves the sector clear.