May 30, 2011 18:21 GMT  ·  By

Portal 2 fans need to put on their thinking hats this week, as Valve, in cooperation with the Thinking with Portal community, has started the special Summer Mapping Initiative contest.

Portal 2 impressed a huge amount of gamers last month when Valve released the first-person puzzle title onto the world.

Now, seeing as how the company already released the Portal 2 mod tools, which allow regular players to create their own maps for the game, the company decided to start a special contest for imaginative level designers.

The Portal 2 Summer Mapping Initiative will see players create their own special maps, for either the single-player or cooperative multiplayer modes, in order to win some prestigious prizes.

Check out the essential rules below, as seen on the ThinkingWithPortals website.

Rules and Requirements -All maps must adhere to the following rules and requirements. Failure to do so will result in your map or maps being disqualified! Have question about rules? Post about it on our forums. -Maps must be submitted no later than June 6th at 11:59pm EDT. -Both Single-player and Co-op maps are allowed. You may submit one map of each game mode. -Maps cannot contain custom assets of any kind. No exceptions. Spend your time working on your puzzle, not making models, textures, sounds/voices, or other extra content. -Maps must contain both an Entry and an Exit elevator, the style of which as appropriate for your map theme. 1940's Aperture maps can use the old style elevators, destroyed Aperture can use the destroyed looking elevators, and so on. -Maps must be able to be completed without using engine or portaling glitches of any kind. -Entries must be uploaded to the ThinkingWithPortals.com Download Database and uploaded in a compressed file format (such as ZIP, RAR or 7z). -Entries must include the source VMF. Contestants shouldn't forget that making a puzzle extremely difficult doesn't make it better, so the levels should be accessible to all sorts of players, not just experienced ones that can blaze through the game in just a few hours.

The first and second place maps will earn an Ultimate Portal 2 Gift Pack, signed by the developers at Valve, and have their creations in the spotlight of both the Portal 2 website and on the Thinking With Portals one.