Fedor van Rossem makes drawings and animation in which he often uses a graphic and clear line style. His specialism is clear graphics, but he also makes cartoon characters and illustrative animation. As a creative visualizer, Fedor makes it possible to portray any unclear shape or situation in a clear and understandable composition. Whether it is about explaining a dream, internet phishing or a map of the human body, it is possible to make an artistic impression. Fedor is inspired by the works of Escher and the impossible figures discovered and developed by Penrose and Moebius. In the KUBST series, a contraction of Art and Cube, an impossible figure is used as the starting point for a puzzle. In this game, the impossible 3d operation is an extra handicap for solving the maze. By walking various stairs and ladders in the figure, it seems possible that you can get everywhere. His puzzles can all be solved. KUBST consists of 3 levels. One level with only stairs and ladders, the second level with doors and the third level with many more doors. The doors in the puzzle have an entrance and exit. This makes them work like portals, which are common in many modern games. Fedor created 'Stairways To Utrecht', a KUBST puzzle but with all the striking buildings from the center of Utrecht. The cities of Amsterdam and Venlo are also available from the Stairways to ... series.