I haven't played Portal but for a flash game. Wow.
this is a great game, but i found a glitch, probably already said:
when you fire a portal though blue lazer, then go through the portal onto the blue floor thing, next to a cube, it bugs up :|
A very greatgame i highly recomend this to everyone and i found a bug in lvl 9 where if you stay in the infinate loop for a while it will glitch you threw the floor.
Great game,a litte easy
Most of the game was easy,but I found some parts difficult, too bad you cant use portals while moving.
i have given one of my highest ratings as it requires an amount of thinking, but not that beyond the average person. i would sugest giving it less levels as it really slows down the loading.