You should use the query hack* to unblock stuff. The way it works is that after you have the URL, you make a query past the URL (with /?.) and then you put an unblocked domain after it (like goguardian.com or bbc.com). The whole thing should resemble this: crazygames.com/?.wikipedia.org
Note that if you want to go to another thing on a blocked website with this (which generally sends you to another link, like crazy games.com/game/ragdoll-archers) you have to right click the link, copy link address, and then paste it into the URL while highlighting everything but the query so that you don't lose it.
*this is not guaranteed to work