Rival's Psychedelic Sixties slot is an online game where players get to ramble from town to town, or commune to commune perhaps, in a brightly painted VW bus with hitch-hikers and hippies. Remember Ken Kesey’s Merry Pranksters who did the same thing while taking part in the Electric Kool-Aid Acid Tests, later adapted by The Beatles into their Magical Mystery Tour?

It’s all enough to induce flashbacks worthy of Syd Barrett, even if you’re too young to remember the Velvet Underground’s peely-Warhol-banana album: turgid loving hearts, long-haired counter-culture heroes, a VW van, lava lamps … you don’t even need the customary experimental recreational pharmaceuticals to trip out in this revived summer of love.

What’s that? You want some counter-culture free love yourself? OK, the number of hearts emblazoned with that little four-letter word multiply the winnings on a given spin. And if you want more than that, you’ll have to visit the Os Man personally, heh heh.  Or else, if free love isn't your game, try these free slots.