Online casino players are being offered the chance to bag a portion of $30,000 in cash courtesy of Liberty Slots and its month-long May Medieaval Money Maker slot tournament.The $5 buy-in tournament will be the first to use the Grail Maiden slot and is due to run until May 31. There will be more than 1,000 cash prizes handed out including $5,000 for the top-scoring player while the runner-up will receive $1,500.Grail Maiden is themed on medieval times and comes complete with a princess and her knight in shining armour spinning across its five reels. The no-payline ‘all pays’ title has the Golden Chalice icon serving as its wild while all wins pay when symbols appear in any position.“Liberty Slots hosts many one-day tournaments every day as well as week-long tournaments with larger prize pools,” read a statement from Liberty Slots.“A complete schedule of daily and weekly cash prize tournaments is under the tournaments tab in the casino.”With this weekend seeing the North American version of Mother’s Day, Liberty Slots is also offering a special matching depositing bonus that is worth up to $400 and available from Friday until May 11.“I think a lot of moms will be relaxing with their favourite slot games this weekend while their kids and hubbies take care of dinner,” said Mark Ramirez from Liberty Slots.“A little bonus money will make that ‘me’ time last a lot longer.”