Assassination is an original mode in Counter-Strike.
Terrorists must assassinate the VIP or prevent the VIP from reaching the extraction zone in order to win the round while the Counter-Terrorists must protect the VIP to win the round. The VIP have to safely reach the extraction zone to win the round as a counter-terrorist.
There are some weapons that cannot be purchased in this mode.
The weapon that cannot be purchased is the AWP
The weapons that cannot be purchased are:
A Counter-Terrorist will randomly be chosen as a VIP and must safely reach the extraction point with the aid of the other counter-terrorist. He can only USP with two spare magazines and a seal knife. The VIP has 200 armor points by default and cannot purchase anything.