While Mario may be teaming up with his old rival to take part in the Winter Olympics, he's still found time to get together with his little brother. The classic RPG elements from the previous games in the series remain, but now the put-upon Luigi can enter the dream world where he can exercise much more power.

Mario & Luigi: Dream Team Bros. features two different locations and gameplay styles; the 3D isometric real world and the 2D dream world. The title primarily takes place in the real world, but Luigi can enter the dream world using Pillow Portals found throughout the real world. Being able to alternate between these two worlds and styles of play, keeps things interesting and helps to provide a new experience in the series.

Playing in the real world feels like the previous titles; you can explore the locations, control the brothers using the face buttons and take place in turn-based fights if you bump into an enemy on the over world. The brothers are primarily controlled using either A (for Mario) or B (for Luigi), with the ability to change what these buttons do (such as jump, attack etc).

Once you enter the dream world, things become much different. In the dream world the top screen is a classic 2D platformer, and the bottom screen is taken up by a snoozing Luigi. Taking a cue from Ghost Trick: Phantom Detective, Luigi can possess certain objects and use them to his advantage.

One such example sees Mario and Luigi unable to climb any higher. Dreamy Luigi (a name given to Luigi in dream world that is bound to cause Freudians to stir) is able to possess a platform, turning it into a giant Luigi moustache, and you can manipulate it to your advantage by pulling on sleeping Luigi's moustache on the touch screen.

Other similarly surreal puzzles are scattered throughout the game that sees Luigi having a bit more agency than he is used to. After all, this is the year of Luigi.

The series' iconic sense of humour remains, with plenty of jokes scattered in the expansive in-game text. Much of it is in-jokes and callbacks, but even casual Mario players are bound to get some laughs out of the title.

Due out in two weeks, Mario & Luigi: Dream Team Bros. looks set to continue the series' tradition of mixing humour, role-playing elements and action. The new dream world elements add a new touch to the series, and we can't wait to get our hands on the full game.