On 2/28/2012 7:38, Warp wrote:
>    I think there has never been an explanation attempt at why you can make
> portals only on some surfaces but not others. Seems like the rule is "if

In the first game, the walls you could portal were tiles and the walls you 
couldn't were clearly metallic. I.e., it was evident it was due to the 
material of which the walls were made.

In the second game, you have the same sort of thing, except with moon rocks 
too, which strengthens that argument a bit.

-- 
Darren New, San Diego CA, USA (PST)
   People tell me I am the counter-example.

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