This is a fun game to play for everyone from 7yo and up, for 2 to 4 players. There are 13 bricks, and they should all be printed twice. Black and white, or any other two color as long as it's easy to keep them apart. They are numbered from 0 to 11, and there must be one of each color. There are also two jokers (*), see below.

Print settings

I printed my game set in PLA, 0.2mm layer height, no supports, and with an infill of 35%. The bricks can be scaled up or down as desired.

The game

Preparations

1. Place all bricks on the table, with the numbers faced down. Shuffle them properly.
2. Each player takes four bricks of your choice (three bricks if you are four players), without showing the numbers to your opponents.
3. Place the bricks in front of you, with the number facing yourself. The bricks must be in order, where the lowest number is to the player's left hand, and the highest on the right hand. The arrows on the back should always point to the same or a higher number. Now this is your secret code!
4. Choose who should begin.

How to play

1. First player picks up a brick from the pile in the middle and then, without showing the number to the opponents, place it in correct order of his/hers code.
2. Now the player points on one of any of the opponent's bricks and takes a guess on what number it is. (Remember that there's only one number of each of the two colors, and that they are placed in order.)
3. If you guessed right, the opponent have to push down that brick, so that everyone can see what number is has.
4. Now the player have two options:
   1. Continue the guessing, by pointing on another brick, either the same opponent or someone else's. This time without picking up a brick from the pile in the middle.
   2. Pass to the next player, and by that make your own code more difficult to guess since you now have increased the amount of numbers in your code.
5. If you guessed wrong, you have to push down the brick you picked up in step #1 for everyone to see.
6. Time for the next player to start with step #1.

The game continues until there's only one code that is unsolved. The winner is the player whose code is unsolved.

Advanced version

You can also play with the jokers (*), which makes it even harder to guess your opponents codes. If you get a joker brick, place it wherever you want in your code, even in between two bricks with the same number, I.E. a white and a black 7. A joker can not be moved to another position if the game has started.

Have fun!