IC: Gunzer-001 A mysterious mech has suddenly appeared. Be on standby, in case support is needed by your mecha. Understood. The Gunzer Custom began walking towards the edge of the battle... OOC: Time for a Test Run.
How about it's something like the Mortal Kombat? Basically, some comic entity has taken copies of all of the characters, and placed them in a new area(The deathmatches are optional).
I like Hardcover if it's a book that I want to have around for a while(Hitchhikers Guide, His Dark Materials) but if I am just at the library, I don't really care.