There are plenty of treats in store for players at Slotastic as Halloween approaches. The online casino is marking the spookiest festival of the year with a series of bonus giveaways with hundreds of dollars on offer.To get things going, players making a deposit of up to $300 between now and 31 October using the special Halloween Bonus coupon code SLTREAT will see it doubled.The festivities get into full flow in the week leading up to Halloween itself with more freebies available.Monday 27th - 100% Bonus up to $150Coupon Code: FASTENUP Tuesday 28th -- 50% Bonus up to $100Coupon Code: SCARED Wednesday 29th -- 75% Bonus up to $100 Coupon Code: LOOKDOWN Thursday 30th -- 25 Free SpinsCoupon Code: SPIDER Friday 31stCoupon Code: HALLOWCOASTERPlayers that take advantage of all of the Halloween bonuses offered between Monday and Thursday will be in line for a free $50 on the Friday.The coupon codes will only work on the day stated so be careful. The first bonus must be claimed to be eligible for the second, and so on.Players looking for some ghoulish fun this month should look no further than Goblin's Treasure which comes complete with 15 free spins and a 5X multiplier. Its Win-Win Bonus Feature guarantees a win during free spins.Another spooky favourite from Slotastic is the 20 payline Haunted Opera which is reminiscent of the gothic horror classic, The Phantom of the Opera.The Halloween-inspired giveaways continue throughout October with random bonuses awarded to players playing these games on specified Wednesdays.Everyone playing the recently released Count Spectacular on 15 October is eligible for bonuses up to $150. Random bonuses of up to $250 will be awarded the following weekend to players enjoying Goblin’s Treasure. The final random giveaway is on 29 October Haunted Opera when players can win up to $250.