How to Make a Game Like Flappy Bird (With AI)

Flappy Bird is the clearest example in games of how a single mechanic, tuned just right, becomes impossible to put down. You tap to flap, gravity drags you down, and you thread the bird through a gap between two pipes. Miss by a pixel and the run is over. There is no level design, no power-ups, no story. The entire game is one interaction repeated until you beat your high score or rage-quit.

That tiny scope is exactly why it is one of the best games to build yourself. The rules are obvious, none of them need tricky physics or networking, and all the fun lives in three numbers you can tune by hand. This guide walks through the four systems that make Flappy Bird work, then shows how to build each one with AI by starting from a template instead of a blank project.

{/* IMAGE: Hero graphic showing a side-scrolling arcade scene, a small bird mid-flap threading a gap between two green pipes, score counter at the top. 1200x675, illustration. */}

The four systems that make Flappy Bird

Strip Flappy Bird down and you are left with four systems. Get these working together and you have the game. Everything else is theme and polish.

System	What it does	Why it matters
Tap-to-flap player	Constant gravity pulls down, each tap gives a fixed upward boost	The single interaction the whole game is built on
Scrolling obstacles	Pipe pairs spawn on the right and move left at a steady speed	The pressure that turns a flap into a challenge
Collision and game over	Touching a pipe, the ground, or the ceiling ends the run	The instant failure that makes every tap matter
Score counter	Add one point each time the bird clears a gap	The number that keeps players coming back for one more try

The trap when building this from scratch is that you spend your first session wiring up scrolling and spawning before you ever feel the flap. That is the boring part, and it is the part a template solves so you reach the fun part first.

Start from the endless-runner template, not a blank project

The single biggest time saver is starting from a template that already scrolls and spawns. On Summer Engine, the endless-runner template ships with a side-scrolling world, an obstacle spawner, a score counter, and a die-and-restart loop already wired together. You open it and you have a playable game on the first run.

A runner and a flapper are mechanically close. Both scroll the world toward the player, both spawn obstacles on a timer, both end the run on a collision, and both track a score. The only real difference is the player's movement: a runner jumps off the ground, while Flappy Bird flaps against gravity in open air. That means you are not building a new game, you are changing one system in an existing one.

Start from the endless-runner template here.

If you want to see what else you can start from, the full template library covers RPGs, platformers, deckbuilders, and more. But for this game, the endless-runner template is the right launch point.

Step 1: Get the base loop running and meet your bird

Open the template and play it once before you change anything. You want to feel the baseline: how fast the world scrolls, how the obstacles arrive, how the run ends and restarts. That baseline is your reference point for every tuning decision later.

Now swap the runner's movement for a flap. This is the heart of the whole conversion:

Change the player movement to tap-to-flap like Flappy Bird. The character should fall under constant gravity, and each tap or click should give a single fixed upward boost. Remove ground-based jumping so it floats in open air.

Play again. The world still scrolls and obstacles still come, but now you control a bird that fights gravity instead of a runner that jumps. This is the rhythm for the whole build: small change, play, decide, repeat.

{/* IMAGE: Before and after of the movement swap, a running character on the left, a flapping bird in open air on the right. 1200x675, illustration. */}

Step 2: Turn the obstacles into pipe pairs

The endless-runner spawns single ground obstacles. Flappy Bird spawns pairs: one pipe from the top and one from the bottom, with a gap between them at a varying height. The bird has to fit through that gap.

You describe the change in plain English:

Replace the obstacles with pipe pairs. Each pair has a top pipe and a bottom pipe with a gap between them. Randomize the gap's vertical position within a safe range so the player never has to flap impossibly high or low. Keep them spawning at a steady horizontal distance apart.

Two values define how this feels. The gap size is the difficulty dial: a wide gap is forgiving, a narrow gap is brutal. The horizontal spacing controls pacing: pipes close together give the player no time to recover, while pipes far apart make the game drag. You will set both by playing, not by guessing, which is why doing it through short prompts beats hunting for the right constant in code.

Step 3: Tune the flap, the gravity, and the gap together

This is the step that makes or breaks a Flappy Bird clone, and it is worth slowing down for. Three numbers decide whether your game feels addictive or annoying, and they only make sense relative to each other:

• Gravity is how hard the bird falls. Too weak and the game feels floaty and slow. Too strong and a single missed tap is unrecoverable.
• Flap strength is the upward boost per tap. It has to be strong enough to climb but not so strong that one tap rockets the bird off the screen.
• Gap size is how much room you have to thread. It only feels fair once gravity and flap are dialed in, because a forgiving gap cannot save bad-feeling physics.

Tune them as a set:

The bird falls a little too fast and the flap feels weak, so it is hard to stay airborne. Soften gravity slightly and increase the flap strength so the bird hovers more controllably. Then widen the pipe gap a bit so a clean flap reliably gets through.

The reason to do this through conversation is speed. Game feel is found by iteration: you change a number, play five runs, notice the bird sinks too fast at the bottom of an arc, and adjust again. Doing that loop in short prompts is far faster than editing one constant at a time. If you want exact control, you can also open the editor and edit the gravity, impulse, and gap values by hand. Both paths edit the same project.

Aim for the Flappy Bird sweet spot: easy to understand in one second, hard to master in a thousand tries. The bird should feel like it is always one tap away from disaster.

Step 4: Wire up the score and the game-over loop

The score is what turns a physics toy into a game. In Flappy Bird, you earn one point for every gap you clear, and the run ends the instant you touch anything. The template already has a score counter and a restart loop, so this is mostly connecting them to the new rules.

Add one point to the score each time the bird passes fully through a pipe gap. End the run immediately if the bird touches a pipe, the ground, or the top of the screen. On game over, show the score and the high score, and let a tap restart instantly.

Two details matter here. First, the restart has to be instant, because the entire appeal of the game is the fast retry loop. A slow or cluttered game-over screen kills the one-more-try urge that makes Flappy Bird work. Second, persist the high score between runs so players have a number to beat. That single stored number is most of the motivation in the whole game.

{/* IMAGE: A minimal game-over overlay showing the current score, a high-score number, and a "tap to retry" prompt over a paused scene. 1200x675, illustration. */}

Step 5: Add the juice that makes it feel good

Flappy Bird is unforgiving, so the feedback has to be crisp. The same run feels twice as good with a small bird rotation, a quick sound on each flap, and a sharp reaction on death. The template gives you a working loop, but this is where you make it feel finished:

Rotate the bird nose-up when it flaps and tilt it nose-down as it falls, so its angle follows its motion. Play a short flap sound on each tap, a ding when the score goes up, and a sharp hit sound plus a brief screen flash on death.

None of this changes the four systems underneath. It changes how they feel, and feel is most of what made the original so sticky. The bird tilting toward its fall is the detail people remember most, and it costs you one sentence to add.

Step 6: Find your one twist

A faithful Flappy Bird clone is fun, but it is also a game millions of people have already played. What makes yours worth sharing is one idea the original did not have. Because the loop is so small, almost any twist reads as fresh:

• A second tap that dashes the bird forward through a gap, adding a skill ceiling
• Collectible coins floating in the gaps that you can risk a tighter line to grab
• Moving or rotating pipes that change the timing every run
• A day-to-night cycle or shifting backgrounds tied to your score milestones
• A two-bird co-op mode where both players share one fragile score

You build the twist the same way you built everything else: describe it, play it, tune it. Because the foundation is already solid, you can spend nearly all your effort on the one idea that makes your version stand out.

What you get for free, and what costs money

Summer Engine is free to use. The endless-runner template, 2D, the conversational build flow, the editor, and export to a real build you can put on the web, itch.io, or a mobile store are all on the free tier. You can build and ship a complete Flappy Bird-style game without paying.

Paid plans exist for heavier AI usage and faster turnaround when you are iterating a lot, which an arcade game encourages because so much of the work is feel passes. But none of the systems in this guide are behind a paywall. If you are starting out, the free tier is the right place to build your prototype and your first release.

Build it

Flappy Bird is one of the most rewarding games to make yourself because the gap between "nothing" and "playable" is tiny, and the gap between "playable" and "addictive" is entirely feel, which is the part AI speeds up the most. Start from the template, get the bird flapping, then tune three numbers until it is impossible to put down.

Start from the endless-runner template or open the AI game maker and describe the arcade game in your head. If you want a broader walkthrough first, our guide on how to make a 2D game with AI covers the same conversational workflow across more genres.