Keystone - A balancing game. Easy to learn. Hard to master.

Intro

Keystone is a calm but surprisingly challenging balancing game for two players. Build a wall from small, asymmetric stones — each piece is different, every round plays out differently, and every move matters.

You can play together as a team, carefully building the tallest and most stable wall you can… or play against each other, taking turns and testing who has the steadier hands and the smarter strategy.

It may look simple at first, but the tension builds quickly: Do you start with large stones at the base? Offset pieces for stability? Take a risk to gain height?

And here’s the twist: every stone could be the „Keystone“ — the one critical piece that holds everything together… or decides the moment it all comes crashing down.

Best of all: Keystone is easy to print on almost any 3D printer, because it only needs a 18 × 18 cm build area.

With 42 unique designed stones and endless combinations, Keystone is easy to learn, but hard to master.

Rules

Goal: Build the tallest stable wall possible — without making it collapse. 

Play against each other

1. Pick your color. But: All 42 stones are shared.

2. Players take turns placing one stone onto the wall. You may build a flat wall, a circle, whatever you want.

3. You may rotate and adjust your stone — but you may only touch the wall during your turn.

4. If the wall collapses, the round ends immediately.

5. Now count only the stones that fell off the wall: For each fallen stone, check which color is facing up. Count how many Blue-up and how many Green-up. The color with the higher number wins the round.

Play together as a team

1. Take turns placing one stone onto the wall.

2. You may build a flat wall, a circle, whatever you want.

3. After each turn, the wall must stand on its own.

4. If the wall collapses, the game ends.

5. Count the remaining pieces in your hand and try to beat yourself in the next round.

Why you'll love it?

• Deceptively simple, surprisingly challenging game

• Play together or compete

• Every game feels different thanks to 42 unique stones

• Compact & easy to print — fits on almost any printer (18 × 18 cm)

Recommended print settings

• Nozzle: 0.4

• Layers: 0.2

• Infill: 25%

• Perimeters: 3

• Seam: Rear

• Infill Speed: 240

• Add a color change at layer 13 and 49 for a three layer design OR add a color change at layer 31 for a two color design

• Optional: If you want the game to be a bit easier, add fuzzy skin in your slicer options. This will cause the stones to stick together a bit more.

• Material: I recommend to use PLA (see below) but other types of filament will work too.

Filament recommendation

I printed this model using Prusa Prusament and got great results. See below for my recommendations.

Prusament PLA Chalky Blue

Prusament PLA Pistachio Green

Prusament PLA Galaxy Black

Copyright

You are welcome to print this model for personal use. Please respect the copyright. Unauthorized reuploads are monitored and reported.

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