Summary

This a small game for a minimum number of 2 players.There is a set of triangles with a different arrangement of 3 possible symbols on it.
Read the instructions on how to play it.

Instructions

Before playing:

You need to print the pieces ;) I suggest to print 10 pieces of each of the variants you find as STL files.
Get a non transparant bag and put all pieces into the bag.
Get a notebook and write down the players names in columns to count points afterwards.

Playing:

Get yourself a table with sufficient space to place the pieces. To identify the player how is allowed to lay the first piece, everybody has to draw a piece from the bag. The one that can start is the one that has 3 equal symbols on his pieces if nobody has such a part the one with 2 equal symbols wins.... . Hope you get the gist.

Draw one piece at the time out of the bag and handover the bag to the next person. Continue doing this till every pieces is drawn from the bag.
Every player should now have several pieces at their disposal.
First move: The one that has won can start with putting a piece h Afe likes onto the table. Then the next persons adds one matching (at least partially) the already laid piece. After first round (everybody laid a piece) we start counting the points.
Each piece that is attached from now on gives the player that laid it points which are counted and noted. Should a player have no matching piece he gets -1 per turn.
As for counting the points the more symbols you touch with your piece the more points you get.

Counting for Beginners:

2 Points: 1 symbol matching (touching side by side)
4 Points: 2 symbol matching (touching side by side)
6 Points: 3 symbol matching (touching side by side)
8 Points: 4 symbol matching (touching side by side)
10 Points: 5 symbol matching (touching side by side)
12 Points: 6 symbol matching (touching side by side) (put in a free triangle with all sides matching)

Counting for advanced players:

same as for beginners but a multiplkator comes into play
Multiplikator 2: if 2 symbols of the same shape are present on the laid piece)
Multiplikator 4: if 3 symbols of the same shape are present on the laid piece)

Small side note

If you turn the piece around the symbols revise their order which could help you fitting it ;)

As for your drawn pieces its up to you to play the game with "open card" or hidden.

In the assembly picture you can see how the pieces can be put together also note that the red one is not allowed.

10th March 2015 added additional files named Triangulus2... which have holes instead of grooves.

My game called Triangulus