A gunship rides the top of the screen and follows your cursor. Hold the mouse button (or a finger) to fire down at the ice. The full-width mahjong wall along the coast is the seawall — when its bricks are knocked out, the ice pours through toward the helicopter, and ice lobbed from the sea can reach the gunship directly. Keep the Wall bar off empty and the chopper alive for the coast's full timer and the coast holds.
Move the cursor and the gunship eases toward it; hold to fire straight down. Shells are fast and travel true, so you line the ship up over the target. As your carbon cut climbs, the gun upgrades on its own — no button to press.
At 2,000 carbon shells become missiles: they turn in the air and home onto the nearest ice, then burst. At 6,500 carbon you get heavy missiles that fire three at once and burst hard through a crowd. The Weapon readout up top tells you what is loaded.
The freeze throws different shapes: glassy cubes, irregular jagged chunks, thin shards that climb fast, and fierce ice-men with glowing eyes that weave side to side. The bigger the ice, the more it takes — a large berg needs two shots and the deep-blue giants need three, because one hit only cracks the shell. Every few spawns is a giant: big, tough, and it takes a heavy bite out of the Wall bar.
Some of the freeze's throws are lobbed straight at the helicopter instead of climbing the wall. They track the gunship as they rise, so you have to shoot them down — let one reach the chopper and the run is over. Watch the toast that warns when one is incoming.
The fierce ice — ice-men, giants and the bigger boulders — shoot shards back at the gunship as they climb. The deeper you are into a coast, the heavier that return fire gets. A shard aimed at the chopper is dodgeable, and your own shells can shoot it out of the air before it lands — but let one through and the gunship goes down.
Now and then a super iceberg shoulders in from the deep and holds station above the coast, swaying and hurling volleys of ice at the gunship. It takes many shots — watch its health bar across the top of the screen — but when it finally shatters it pays out a wall-mending reward and a big carbon bonus.
Ice you shoot down sometimes drops a glowing power-up that floats up — fly the gunship into it to grab it, like a shmup. Heal mends a stretch of the wall, Rapid speeds the gun for a few seconds, Upgrade climbs the weapon a tier, Bomb clears the smaller ice off the board (and dents the boss), and Leaf banks a carbon cut — fly through one to pull CO₂ out of the air. The boss always drops one.
Kill ice without a gap and the chain climbs, paying more per kill the longer it runs. When ice reaches the wall, a single ram knocks the brick clean out — so a neglected lane caves in after only a few hits. A fully emptied column is a breach — the ice climbs through it toward the gunship, so mend it fast. The wall mends as you fight — every few kills a few tiles refill — but a breach you leave open is dangerous until you shoot it closed. Let the Wall bar hit empty and the sea breaches the coast. Ice you shatter is captured before it can melt; only ice that breaks through the wall melts into the rising sea.
Frostveil is an independent practice game built around the 152 real American-mahjong tiles. It is not affiliated with the National Mah Jongg League (NMJL); the current official NMJL card remains the final authority on every rule. Sea-level rise and storm surge are real risks for low-lying coastal cities — the numbers here are simplified to make a playable minute.
Frostveil is a free, browser-based helicopter shooter set along a frozen stretch of the American coast. You fly a gunship near the top of the screen, aim with your mouse or finger, and fire down at ice boulders, jagged chunks, and fierce ice-men climbing a seawall made of real mahjong tiles. Larger ice takes two or three shots to break, and every so often a super iceberg moves in from the deep. Every solid hit pulls carbon out of the air, so a strong run leaves the coast a little cleaner.
It runs on desktop and mobile with no download and no account. The tile wall uses the 152 tiles of American mahjong as a backdrop; the game is an independent practice build and is not tied to any league or official rule set.