Initial setup

Play with four players.
Each player as a colored pen: red, green, blue and black.
Each player places a dot on the sheet at an arbitrary position but not further than 10 cm from each other.
The players take turns.

Task to be performed every turn by each player

Draw a straight line

The line must connect two dots.
The angle of the line must be within the following range: 0 to 45 degrees for the black lines, 45 to 90 degrees for the blue lines, 90 to 135 degrees for the red lines, 135 to 180 degrees for the green lines.
Connect the line to an existing line if possible.
Draw the shortest possible line from your starting point. If you enclose an area (a plane surrounded by lines) then hatch it with lines parallel to the line you enclosed the area with. The enclosed area may not contain unconnected dots or open ended lines.

Place a dot

The position of the dot is not further away than 10 cm from other dots and not inside the convex hull of all dots.

Rule

End each turn with a perfect circle which is larger than the previous one

Tasks Performed All Following Turns by Each Participant


Folding the paper

Bring your corner of the paper to the end of the line drawn by the participant on your right.
If that participant has only placed a dot, bring your corner to that dot.
While keeping the corner at its position, press the paper flat and make a fold.
Unfold the paper again to its standard position.
If the fold is almost parallel to the edge of the paper, place some small dots at the ends of the fold, so to clearly mark it as your fold.

Draw a straight line

Start your line at the end of your last drawn line.
Your line should always follow a fold.
Your line may cross other lines but it may not be on top of other lines.
The end of your line should always be where one of your own folds crosses a fold by someone else.

Instructions

Each turn, find the most empty space on the paper and place a dot in the middle of it.