Un Monstre Dans Le Placard [A Monster In The Closet]

It's the annual family gathering weekend at Grandpa's house. Everything was going well, until your nephews refused to go to bed because of a so-called "monster". Convinced that it is a bad dream, you take their room to prove it to them. But nightmare or not, you find yourself, in turn, trapped in the universe of monsters. You have no choice but to face their Big Boss. To stand a chance in this final fight, you must find and destroy the monster's three Life Artifacts. But these are protected by guardians, in parallel universes...