So swamp football then, eh? It's like regular football, only swampier. Much swampier, in fact. So swampy you can barely move, no less.

This year's swamp football world cup - yes indeed, there's a swamp football world cup - is being held in China, with Beijing playing host to 32 teams over several 25m x 15m swamps, kicking and scrapping and sloshing it out for the grand prize.

A few swamp football details for you, just to get your head around it:

• There's no offside rule
• You can substitute as many people on and off as you like
• Only six people on the pitch at one time
• Your squad must be made up of 12 people
• Boots may not be changed during the game
• It's a game of two halves (of course), each lasting 13 minutes each

Got that? Lovely stuff. And to help you understand just want an amazing sport this is, take a look at our gallery of some of the competitors in action below - but God bless you if you can work out who's on which side...

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