NumPlay

17 free games for your NumWorks calculator, in one app.
Plus Hollow Knight, Celeste and Champion Island, three big games that come as apps of their own.

How to install  ·  How to play  ·  See it on a real calculator

New: Hollow Knight, from King's Pass to Hornet in Greenpath.  And NumBlocks, a world like Minecraft 1.8.

_{NumDash, Crossy Road, NumBlocks, NumDrive, Balatro, Buckshot Roulette, Portal Returns, Tetris, Chess, Flappy Bird, Pac-Man, Snake, Connect Four, Solitaire, 2048, Minesweeper and Block Breaker, plus NumVisuals: moving backgrounds with a clock, a timer and more.}

⭐ Enjoying NumPlay? Give it a star

NumPlay is open source and completely free, and it took a lot of work to make. If you like it, please click Star at the top of this page. It only takes a second, and it helps other people find NumPlay.

Want a game that isn't here? I'm open to requests: email me at masonchen204@gmail.com.

New: NumBlocks

Mine, craft and survive in a world like Minecraft 1.8, right on your calculator.

• Endless worlds: the same biomes, caves and trees as Minecraft 1.8.8, for any seed.
• Survival: chop trees, craft tools, build a shelter, and fight zombies, skeletons, creepers and spiders at night.
• Creative: fly around and build with every block.
• Your worlds stay: keep several, and they come back even after you install again.

It's in NumPlay too.  More about NumBlocks  ·  How to play

New: Hollow Knight

Explore Hallownest as the Knight, right on your calculator.

• The start of the journey: King's Pass, Dirtmouth, the Forgotten Crossroads and Greenpath, up to Hornet.
• The Knight moves like in the game: the same jumps, nail slashes, pogos, dash, focus and Vengeful Spirit.
• Its bosses and people: the False Knight, Gruz Mother and Hornet; Elderbug, Sly, Iselda, Cornifer and more.
• Everything to find: geo, charms, mask shards, vessel fragments, grubs, the map and the stag stations.

It fills the calculator's app space, so it comes on its own.  More about Hollow Knight  ·  How to play

New: Celeste

Climb Celeste Mountain with Madeline, right on your calculator.

• The whole climb: the Prologue, all eight chapters, the Epilogue, and every B-side and C-side.
• Madeline moves like in the game: the same jumps, dashes, climbing and wall jumps.
• The story: every conversation with Theo, Granny, Oshiro and Badeline, with their portraits.
• Everything to find: strawberries, crystal hearts, cassettes and the Summit's gems.

It fills the calculator's app space, so it comes on its own.  More about Celeste  ·  How to play

On a real calculator

Filmed on my own calculator, no emulator.

Go support the original games!

NumPlay is a fan project, made out of love for these games and for the NumWorks calculator. It is not meant to replace any of them. If you enjoy a game here, go play the original and support the people who made it.

NumWorks also has a great community of people making games by hand, some of them over years. Go try their work too: Numcraft, Celeste Classic, Tatone26's All the Apps, the apps on Nwagyu and many more in yannis300307's list.

Download

Click a file to download it. Not sure which one? Take the first.

The first three are the same app with the same games: only the icon and the name change. Your progress is saved on the calculator either way.

How to install

You need your calculator, its USB cable, and a computer with Google Chrome or Microsoft Edge. It takes about 2 minutes.

1. Download a file from the table above. It goes to your Downloads folder.
2. Plug your calculator into the computer and turn it on.
3. Go to my.numworks.com/apps and log in. No account? Sign up there, it's free.
4. Click Connect, then pick your calculator in the small window that opens.
5. Add the file you downloaded, then click Install. Keep the calculator plugged in until it's done.
6. Play! On your calculator, press the Home key (the little house), go to the end of the apps and open NumPlay.

[!TIP] Updating? Install the new file the same way. Your progress comes back by itself: NumPlay keeps a copy of it in a Python script called numplay_saves.py, the one kind of file the website keeps. (This works for updates from version 1.2.1 on.)

Already have other apps from that website? It swaps them for the new ones, so add them again in step 5 to keep them. The calculator's own apps are never touched.

Nothing happens when you plug it in? Try another cable: some only charge.

Gameplay

Acknowledgements

• Tatone26's All the Apps inspired NumPlay's list of classics. Flappy Bird, Pac-Man, Snake, Connect Four, Solitaire and 2048 are written in C for NumPlay and keep its options, with no code copied from it. Tetris is Tatone26's own, which they released into the public domain, adapted for NumPlay.
• Gabriele Cirulli made 2048.
• Snake, Solitaire and Block Breaker look and play like Google's games in Search. They are drawn from scratch; nothing is taken from Google.
• gd3ds by AleFunky and friends, whose research into Geometry Dash made NumDash possible. Clubstep, Deadlocked and Dash also rely on gdsolver's measurements of Geometry Dash 2.2, level data from gmdkit by HDanke and checks against GDRWeb by IliasHDZ.
• Balatro by LocalThunk inspired NumPlay's Balatro, which uses art adapted from the game and the m6x11 font by Daniel Linssen.
• Minecraft by Mojang inspired NumBlocks, which uses Minecraft 1.8.8's textures, font and screens and makes its worlds the way Minecraft 1.8.8 does.
• Celeste inspired NumPlay's Celeste, which uses the game's own pictures, maps, texts and fonts. Not affiliated with Maddy Makes Games.
• Hollow Knight inspired NumPlay's Hollow Knight, which uses the game's own pictures, animations, maps, texts and fonts. Not affiliated with Team Cherry.
• Buckshot Roulette by Mike Klubnika inspired NumPlay's Buckshot Roulette, whose scenes are rendered from the game through the Open Buckshot Roulette project (1503Dev). Fonts: Fake Receipt by Ray Larabie and Dot Matrix by Dionaea.
• The Doodle Champion Island Games (2021) inspired Champion Island, which uses the doodle's own pictures, maps and texts from the Google-Doodle-Champion-Island archive by potherca-blog, and the PixelMplus font by Itou Hiroki (license).
• Portal Returns by MateoConLechuga for the TI-84 Plus CE, with sprites by CKH4 and Portal Prelude chambers ported by Unicorn from BuilderBoy's original.
• The Nunito and Rammetto One fonts, under the SIL Open Font License (LICENSES).
• reversal_lava63, a beta tester who plays NumPlay's apps on a real calculator and reports what's wrong.

License

NumPlay is licensed under the GNU General Public License v3.0. Copyright (c) 2026 Mason Chen.

Code and fonts from others keep their own licenses: the UNLICENSE files in the games' folders and the LICENSES folder. The names, artwork and music of the games NumPlay is inspired by belong to their makers and are not covered by it.

_{Unofficial fan games, not affiliated with NumWorks, RobTop Games (Geometry Dash), Hipster Whale (Crossy Road), the makers of Drive Mad, LocalThunk or Playstack (Balatro), Mike Klubnika or Critical Reflex (Buckshot Roulette), Mojang or Microsoft (Minecraft), Maddy Makes Games (Celeste), Team Cherry (Hollow Knight), MateoConLechuga (Portal Returns), Valve (Portal), .GEARS (Flappy Bird), Bandai Namco (Pac-Man), Hasbro (Connect Four), Google (Snake, Solitaire, Block Breaker, Doodle Champion Island Games), STUDIO4°C or Microsoft (Minesweeper). Tetris is a trademark of The Tetris Company, Minecraft of Mojang Synergies AB, Pac-Man of Bandai Namco and Connect Four of Hasbro.}