The one with the cats, where you have to make "S P E L L" across all five reels... How fricking annoying is THAT!!???!? When the letters are not just taking up space, they're awarding a less than great feature... and HOW MANY TIMES CAN YOU GET THE FIRST FOUR BUT NOT THE FIFTH!!!
I've had to ban myself from playing it after dropping £500 into Royal Vegas thinking the deadly "it's got to do something pretty soon..."
