It features teams from across Europe including England, Scotland, Wales, France and Russia.
Amateurs Thornhill Trojans provided the first surprise result by beating national 2 team Workington Town.
Hull KR pulled off a major surprise when they beat Superleague team Warrington Wolves.
Huddersfield have the chance to win the Cup for the first time in 1953 when they beat this year's final opponents St Helens.
Teams: St Helens: Paul Wellens, Ade Gardner, Jamie Lyon, Willie Talau, Francis Meli; Leon Pryce, Sean Long, Paul Anderson, Keiron Cunningham, Jason Cayless, Jon Wilkin, Paul Sculthorpe, Jason Hooper Subs: Lee Gilmour, James Roby, James Graham, Maurie Fa'asavalu Coach: Daniel Anderson Huddersfield: Paul Reilly, Martin Aspinwall, Stephen Wild, Michael De Vere, Stuart Donlan, Chris Thorman (c), Robbie Paul, Paul Jackson, Brad Drew, Jim Gannon, Chris Nero, Andy Raleigh, Stuart Jones Subs: Paul Smith, Eorl Crabtree, Steve Snitch, Wayne McDonald Coach: Jon Sharp The tournament was screened in the United Kingdom by the BBC.