Portal, a part of the orange box (~40$, also has HL2, HL2: ep1, HL2: ep2 and TF2 in the same package) or sold separately (~23$). There´s also a flash version here on newgrounds called portal: the flash version with similar gameplay but original maps.
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Portal
<a href="http://www.youtube.com/watch?v=R4wFy_tNhpc">http://www.youtube.com/watch?v=R4wFy_
tNhpc</a>
<a href="http://www.newgrounds.com/portal/view/404612">http://www.newgrounds.com/portal/view /404612</a>
There's the flash version.
Massacure99
portal or transporter