RHEM 4 reveals another yet unknown part of the mysterious island of RHEM. The story continues where “RHEM 3: The Secret Library” ended, but the game can also be played independently of the RHEM Trilogy. The player unlocks the gateway to a previously unexplored part of the island as the new adventure begins. Once again a sense of adventure, logic, assertiveness and the ability to solve problems will help the player to slowly but surely unveil the mystery of this new adventure.

The discovery of a secret transport system allows the lead character, Kales, to search for an exit from the RHEM something that has been forbidden throughout the series until now. The player will have to collect several parts of a key to allow them access to that transport system. Once again the player is on their own to explore this huge, fantastic world full of strange vehicles and buildings, unknown mechanisms and machines, secret passages and doorways, though players will this time meet new characters, who can help them solve some of the mysteries they will face. As ever everything is part of one big enigma, and the gamers task is to find the answers one by one and solve the mystery of RHEM.