Asteroid Blitz Tips: Split the Rocks, Survive the Debris (2026)

1. What you are actually playing

Asteroid Blitz is an endless wave shooter on an 800 x 600 wraparound field. There are no walls: fly off the right edge and you come back on the left, fly off the top and you come back on the bottom. Every asteroid you shoot splits into three smaller rocks, so one large rock becomes three mediums and then nine smalls before it is gone. You get three ships per run, a wave ends when the field is clear, and the next wave spawns one more rock than the last, up to twelve.

The scoring is weighted toward the smallest rocks, so a run is worth more the longer you keep breaking things down. There is no timer and no level cap beyond twelve rocks per wave; the only thing the game records is your best score.

2. The three sizes and what they are worth

• Large (scale 6): 20 points. Splits into 3 medium.
• Medium (scale 2): 60 points. Splits into 3 small.
• Small (scale 2/3): 180 points. Destroyed on hit.

A single large rock is worth 20 + 3x60 + 9x180 = 1820 points if you break it all the way down, but only if you survive the nine smalls it produces. The lesson is to break one rock at a time and clear its debris before touching the next, because nine smalls flying in different directions is the most dangerous thing on the field.

3. Ship handling

Thrust is 0.5 per frame along the direction you face, and the ship caps at speed 8. Turning is 6 degrees per frame, so a 180-degree reversal takes 30 frames, about half a second. Inertia carries you after you stop thrusting, and the speed cap keeps you from outrunning your own bullets.

Practical rules:

• Thrust in short bursts, not holds. A held thrust overshoots and you spend the next second correcting.
• Turn before you thrust. Point the nose where you want to go, then tap thrust.
• Use the wraparound deliberately: crossing an edge is the fastest way to escape a cluster, because the rocks do not follow you instantly.
• Do not chase a rock. Match its speed and angle, then fire.

4. Shooting and the 10-round clip

You fire every 10 frames, roughly six shots per second, from a pool of 10 bullets. Each bullet lives 50 frames and travels 6 px per frame plus your own velocity, so a bullet covers about 300 px before it expires. Bullets wrap around the screen too, which means a shot fired near an edge can hit a rock on the other side.

• Lead the rock. A medium moving at 2 px per frame covers 100 px in the 50 frames a bullet lives, so aim ahead of it.
• Fire in short bursts of two or three, then stop and reassess. Emptying the clip into empty space leaves you unable to shoot for the time it takes the pool to recycle.
• Do not fire at smalls you cannot hit. A small is 180 points but also the hardest target; two misses cost more than the hit is worth if a medium is closing in.

5. Debris is the real enemy

The danger is not the rock you are shooting, it is the three fragments that leave it. Each fragment gets a random velocity of -3 to +3 on both axes plus a push of three times its scale, so mediums leave fast and smalls leave faster.

• Shoot a large only when you have room. The three mediums it produces will spread, and if they spread into other rocks you get a chain reaction of debris.
• Clear smalls first when they cluster. A small is fast and hard to track; leaving three of them near your ship is worse than leaving one medium.
• Keep one side of the screen clear as an escape lane. If debris fills the whole field, cross an edge and let the rocks redistribute.

6. The UFO

A UFO appears between 30 and 60 seconds after the run starts, crosses the screen horizontally at 1.5 px per frame, and drifts vertically toward whichever side of the screen has more rocks. It fires every 22 frames in a random direction at 6 px per frame from a three-round clip. Hitting it is worth 200 points and it repositions to the other side.

• The UFO's shots are random, not aimed, so most of them miss. The danger is volume: three bullets every 22 frames over a long crossing.
• Shoot it when the field is nearly clear, so you are not juggling rocks and UFO bullets at once.
• If it crosses off-screen it simply repositions; you do not lose anything by ignoring it.

7. Lives, death and respawn

You start with three ships. On a collision with a rock, the UFO or an alien bullet, the ship explodes, one life is lost, and after about a second you respawn at the centre if any lives remain. The rocks and the UFO stay where they are, so a respawn can drop you into a cluster.

• After a death, do not thrust immediately. Check the centre is clear; the ship only spawns when it is not overlapping anything.
• Treat the third ship as your scoring ship. The first two are for learning the wave; the third is where you push for a best.
• A new best score fires game_win and saves to localStorage under asteroid-blitz-best. The best never resets between runs.

8. Wave progression

Wave 1 spawns 2 rocks, wave 2 spawns 3, and so on up to 12. Each wave waits one second after the last rock is cleared before spawning the next batch. Early waves are practice; from wave 5 onward the field is crowded and you should prioritise survival over score.

9. Common mistakes

• Shooting the largest rock first. It produces the most debris and the lowest score per shot. Work smalls and mediums first when you can.
• Holding thrust into a rock. Inertia carries you through the impact. Thrust to position, then cut thrust and fire.
• Ignoring the wraparound. The edges are an escape route, not a wall.
• Chasing the UFO through a crowded field. 200 points is not worth a ship.
• Panic firing. An empty clip is a dead ship if a small is closing in.

FAQ

How is this different from the rules on the game page?

The game page covers operating the ship: rotate, thrust, fire, and press Play again to retry. This guide assumes you know that and works the layer above it: the three rock sizes and their scores, the 10-round clip, the UFO timing, and the wave curve. Read the rules on the page, then work the strategy here.

Does the game get harder as I score?

Yes, but only by rock count. Each cleared wave spawns one more asteroid than the last, up to twelve. Speed, split count and UFO timing do not change. The difficulty is volume, not velocity.

What is the highest possible score?

There is no cap. The run ends when you lose your third ship, and the best is stored locally, so the ceiling is your own skill. Because rocks only get more numerous, long runs need both clean shooting and careful debris management.

Why do rocks sometimes pass through each other?

They do not collide with each other; only the ship, bullets, the UFO and alien bullets collide. Rocks pass through rocks freely, which is why a single shot can start a chain of splits across the whole field.

Does the UFO aim at me?

No. It fires in a random direction every 22 frames. Its vertical drift is toward the denser side of the screen, not toward you, so it is not hunting you. Treat it as a hazard that happens to be there.

Does the best score carry over between devices?

No. The best is stored in the browser under asteroid-blitz-best, so it is per device and per browser. Clearing site data resets it. There is no global leaderboard and no account.

Where can I play it?

Right on this site's Asteroid Blitz page. The build is the upstream dmcinnes/HTML5-Asteroids engine at commit 930301cb under the MIT licence, with Playnesta additions: the jQuery dependency was removed in favour of vanilla JS event wiring, and the page shell, viewport and meta tags, HUD, modal, analytics bridge, touch and mouse controls, viewport handling, best-score persistence and the product rename to "Asteroid Blitz" are Playnesta's. "Asteroids" is a registered trademark of Atari; this implementation uses the generic public-domain arcade mechanic with original Playnesta art and the product name Asteroid Blitz to avoid that mark. Playnesta Games is the developer and publisher of this web implementation.