Good Intelligent Games

[Oxydium]

I recently played Braid and Limbo and i loved every minute of it. I also been a huge fan of the Portal games. What other games do you recommend that use a gameplay as original as my example? thx

 

[kingcom]

Your title is extremely deceiving. I came in thinking you wanted games that we're intelligent and instead you want original gameplay. Original to what exactly, how long have you been gaming? Wolfenstein is pretty original.