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Bonus Maps: Challenge Maps

After you "unlock" test chambers 13 thru 18 by getting through them on a normal playthru, you can go to the bonus maps option on the game's main menu and choose to replay each chamber while under a challenging new restriction. You get to choose your restriction, and it can be least portals, least steps, or least time.
How do these three challenge types work?

Below, I provide hints on getting the best scores I was able to get on the challenges that didn't seem too hard or tedious to even try. If you have a good technique for a challenge not covered below, or a better technique (not just a better time) for one that is covered, write to me at dunigase@yahoo.com and tell me about it.

Chapter 13 with Least Portals

Chamber 14 with Least Portals
Chamber 14 with Least Steps
Chamber 14 in Least Time

Chamber 15 with Least Portals

Chamber 16 with Least Portals

Chamber 17 with Least Portals (Method 1)
Chamber 17 with Least Portals (Method 2)

Chamber 18 with Least Portals

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