Pixel Siege

Physics Puzzle

Pixel Siege is a slingshot physics puzzle in the spirit of Angry Birds, and one of the six free games in the RobuxClicker Arcade. Pull a bird back on the slingshot, let go, and watch a parabolic arc, real gravity and crumbling structures decide whether the pigs hiding inside survive.

About the game

Pixel Siege takes one of the most satisfying ideas in casual gaming — fling a projectile, watch a building fall down — and builds forty handcrafted puzzles around it. Every level sets a structure of wooden, icy and stone blocks in front of you, with a few green pigs sheltering somewhere inside it. You are handed a fixed queue of birds and one job: knock out every pig before you run out of ammunition. Miss your shots, and the pigs sit there grinning while your last bird thuds harmlessly into the dirt.

Under the cartoon surface is a genuine physics engine. Every bird flies a real parabolic arc governed by gravity, and every collision is resolved with axis-aligned bounding boxes and impulse-based responses. Blocks have weight and bounce. Knock out a block that is holding others up and the whole stack above it loses its support and tumbles down — and a falling block does damage of its own to whatever it lands on. The whole game is drawn from data-defined pixel art straight onto an HTML5 canvas at a native 960 by 540 resolution, scrolling across a 2400-pixel-wide world and running at a smooth 60 frames per second, so it loads instantly and plays the same on a laptop or a phone.

What makes Pixel Siege a puzzle rather than a toy is the star score. Finishing a level is only the start; each level rates your run from one to three stars based on how many points you scored. Reaching three stars means destroying nearly the whole structure and finishing with birds to spare, which forces you to think about which bird to spend where, and to find the one shot that brings the most down at once. There are 120 stars to collect across four themed worlds, and the later castles do not give them up easily.

Ready to take aim? Launch Pixel Siege and come back here whenever you want a refresher on the controls or the strategy below.

How to play

Pixel Siege is played entirely with a mouse or a touchscreen — there is nothing to learn on the keyboard. Pick a world, pick a level, and the slingshot is waiting with your first bird already loaded. The controls below are the complete set.

On a computer

• Aim: click the bird sitting on the slingshot and drag it backward, away from the structure. The farther you pull, the harder the launch — and a dotted line of fifteen preview dots shows the arc your shot will take.
• Launch: release the mouse button. The elastic bands snap back and the bird flies.
• Trigger an ability: while the bird is in flight, click anywhere on the screen. Each bird's special ability fires once per launch, so the timing of that click matters.
• Scout the level: before you launch, click and drag an empty part of the background to pan the camera right and study the whole structure. Release and the view slides back to the slingshot.
• Pause: click the pause button in the top-right corner to resume, restart the level, or exit to the menu.

On a phone or tablet

• Aim: touch the bird on the slingshot and drag it back, exactly as you would with a mouse. The trajectory dots update as you move your finger.
• Launch: lift your finger off the screen to let the bird fly.
• Trigger an ability: tap the screen once while the bird is in the air.
• Scout the level: drag an empty part of the screen to pan the camera across the structure before you commit to a shot.

Tips and strategy

A first run usually means launching birds and hoping. These tips will turn that into deliberate, three-star play.

1. Match the bird to the material. Each block type has a weakness. The Yellow bird's speed boost tears through wood, the Blue bird's three clones shatter ice, and the Black bird's explosion is built for stone. Look at what a structure is made of before you decide which bird to spend.
2. Time your abilities. An ability only fires while the bird is in flight, and only once. Tap too early and you waste the boost in open air; tap just before impact, when the bird is lined up on its target, to get the most out of it.
3. Aim for the base. Because a destroyed block stops supporting whatever rested on it, knocking out a load-bearing block low in a tower can collapse the entire stack above. One good shot at the foundation often does more than three shots at the top.
4. Scout before every launch. Drag the camera right and read the layout — where the pigs are, what is shielding them, and whether one is exposed from behind. A few seconds of scouting saves a wasted bird.
5. Use the Green bird for hidden pigs. Its boomerang ability reverses the bird's direction in mid-air, so you can sail it over a stone wall and bring it back down onto a pig sheltering behind cover.
6. Finish with birds to spare. Every bird left unused when you win is worth 10,000 points — the same as destroying a King Pig. Solving a level with two or three birds still in the queue is usually how you cross the three-star threshold.
7. Remember the Black bird detonates on contact. If you forget to tap, it still explodes automatically on its first collision. Tapping is better because it lets you choose exactly where the blast lands, but a forgotten Black bird is never completely wasted.

Game details

Pixel Siege is a complete forty-level campaign. Here is what is inside it.

Seven bird types

The dependable Red bird, the Blue bird that splits into three clones, the Yellow bird with a triple-speed boost, the Black bird that explodes in an 80-pixel blast, the White bird that drops an egg bomb straight down, the Green bird whose boomerang reverses its flight, and the heavy Big bird that simply plows through structures. New birds are introduced world by world.

Three block materials

Wood, ice and stone, each tougher than the last and each with its own weakness. Every material comes in five shapes — square, wide, tall, plank and pillar — and blocks visibly crack as they take damage, passing through pristine, cracked and breaking states before they shatter.

Four pig types

Small, Medium and Large pigs make up most levels, while the crowned King Pig — far tougher than the rest — appears only in the heaviest fortresses of the final world.

Forty levels across four worlds

Sunny Fields is a gentle, wood-built tutorial; Frosty Peaks raises the difficulty with ice fortresses; Desert Ruins mixes wood and stone; and Dark Castle is an expert-level stone gauntlet that ends with a King Pig boss level. Each world holds ten levels.

Star scoring

Every level can be won with one, two or three stars depending on your score. Points come from squashed pigs, destroyed blocks and any birds left unused at victory — there are 120 stars to collect in all.

Progress that saves

Your best score and star rating for every level are stored in your own browser. Clearing a level unlocks the next one, and earning stars on enough levels unlocks the next world.

Frequently asked questions