http://www.youtube.com/watch?v=yFyT05yXNsw&feature=plcp

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This week's challenge is Light Bridges.

It has just three rules:

1. Your puzzle must contain two light bridges.
2. Both light bridges cannot be on at the same time.
3. Both must be used to solve the puzzle (though obviously in different steps).

Everything else, I leave to you. They can be activated by the same element or different ones, so long as it's impossible to activate both at once.

Some methods to get you started:

* Link one button to both bridges, but start one bridge active, the other inactive.
* Both bridges are activated the same way (such via a cube button) but the player only gets one activation item (such as one cube).
* Two portals are required to activate either bridge (such as via portaling lasers into laser catchers).
* Both bridges are connected to timers, but it is impossible (EVEN WITH PORTALS) to reach the second timer before the first expires.

To submit puzzles to this challenge, post a link to them on this thread.

The three best entries will be selected and featured on the Monday Madness episode of the Portal2Cast, 9-3-12.

Puzzles are graded on:

1. Presentation & Lighting: Is it pretty?
2. Navigation & Layout: Is it needlessly hard to traverse for reasons unrelated to solving?
3. Transparency: Does the player have obvious goals? Is it clear what everything does?
4. Elements-to-Difficulty Ratio: The harder your test is to solve, the fewer elements it should contain. (Anyone can make a test so clogged with buttons and triggers that it's hard to see what to do.)
5. Playtesting: Can your test be beaten in unintended ways?
6. Did it meet the requirements for the challenge?

Good luck, and as always, thanks for mapping!
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The Portal2Cast is a 15-minute daily show with one goal: Making you a better builder.

www.youtube.com/user/portal2cast