With the Polar Vortex in the USA, how appropriate for Slotastic Casino to name this weeks slot being Polar Explorer Receive a 50% deposit bonus of up to $100. Use coupon code SOWFREEZE before making your deposit. Code is valid until January 13, 2014. Slotastic Casino has some incredible Jackpots from Progressive and Randoms just sitting there waiting to be hit. Use this nice bonus and see if you can hit one.