Quadrospass is a more difficult variation of Triadenspass.
"The Quadrofun is a game which the solution appears easier on the first sight as it actually is. The 2 rhombus and 2 triangle formated game-stones have to be put into a game plate. The edges of the game-stones are unequal, each game-stone is singular and so there is only one combination (only one?) to put them into the game plate. The perplexing part of the game is the apparent facility in contrast to the actual expenditure. If the 4 stones are in their right position the view looks like a cube." -Logika