Mark Penacho informed us that the voices on the game are Mark Ritchie and Soumya Netrabile (she wrote game manuals). Sample games have an Earthquake Institute that sinks into the playfield. Reportedly, an estimated 200 of these sample games were produced before this feature was made stationary due to costs, and their cabinets are said to be a lighter blue than the later games. Actual measured weight: 248 lbs (includes legs). Production Run Records for Earthshaker: Production Start Date: Feb-21-1989 Production End Date: May-25-1989 Production Run Quantity: 5257 First ship date: Feb-28-1989 Last ship date: Oct-20-1989 (1 last unit had remained in inventory since Jun-30-1989)