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(right now I don't have test cases. I'm going to add some later!)

6. This is code golf so shortest working code in bytes wins!

6. This is code-golf so shortest working code in bytes wins!

Test cases (based from comments, commas separate columns, semicolons separate rows):

Truthy:

"" rc,gc,bc,oc,pc,yc;rs,gs,bs,os,ps,ys;rf,gf,bf,of,pf,yf;rz,gz,bz,oz,pz,yz;rm,gm,bm,om,pm,ym;rr,gr,br,or,pr,yr 

Falsy:

rc,rs,rf,rz,rm,rr,rf rc,rs,rf,yc 

• each line (horizontal or vertical) of touching tiles must contain any distinct tile at most once and only tiles of different color and same shape OR tiles of different shape and same color!

• every tile has to touch ar least one neighboring tile! No single/islands of tiles!

• if different colored shapes go in the verticals, all the horizontal lines of the field have to be of 'different shape and same color'

• (see example image below for understanding!!)

• It's important to note that a valid game evolves around one start position. This means, any tile on the field has to touch any other tile through other tiles. There can't be single tiles or islands of tiles disconnected from the main starter island. So, any tile has to touch at least one other tile.

• there are only 3 tiles of each color and shape in total. So there can't be, for example, 4 red square tiles or 4 green circles.

• directions matter! At the start of the game, players decide (by placing the first row of tiles) which direction different colors of the same form go (horizontal or vertical). Same shape in different colors then automatically go in the other direction (vertical or horizontal). This won't be changed within a game. Example: when you start with a row of red tiles in the horizontal, you can't make a row of red tiles in a vertical line for the rest of the game.

• each line (horizontal or vertical) of touching tiles must contain any distinct tile at most once and only tiles of different color and same shape OR tiles of different shape and same color!

• every tile has to touch ar least one neighboring tile! No single/islands of tiles!

• It's important to note that a valid game evolves around one start position. This means, any tile on the field has to touch any other tile through other tiles. There can't be single tiles or islands of tiles disconnected from the main starter island. So, any tile has to touch at least one other tile.

• there are only 3 tiles of each color and shape in total. So there can't be, for example, 4 red square tiles or 4 green circles.