Vale of DunanEdit
In season 1, Riddle Bridge was credited as Vale of Dunan, and was always played by the warrior in first place and another warrior of their choosing. The leader would walk the path whilst the other would work the book.
When opened, the book would speak a riddle in rhyme to the warriors, who would then attempt to work it out. Stones were laid out with letters on and so the warrior must spell out the correct answer. If the leader stepped on the correct stones, they would progress to the rings; if they stepped on a wrong stone, they would disappear in a flash of blue fire and lose a life. The helper's life was not at risk. The blue fire is what Raven calls the "Mists of Dunan", the thing that makes the Vale so deadly in such a beautiful area.
At the far end of the stone letters was a skull totem pole with two gold rings on it. Once the warrior reached the rings the curse had been lifted and so they could walk back along any stones on the path. Once they were back it was up to the leader to decide how the rings were given out (whether they would keep both or give one or both to their helper).
This challenge was always played as last challenge before Way of The Warrior on Tuesday, last challenge before Way of The Warrior on Wednesday and second challenge of the day (after Spider Tunnel) on Thursday of each heat. If the leader got the riddle wrong on Tuesday (which he most often did), it'd carry over to Wednesday (Raven wouldn't reveal the answer at the fail). If he got the riddle right on Tuesday and/or Wednesday, a new riddle would be brought out for the next day. If the riddle wasn't correctly solved on Thursday, Raven would reveal the answer.
Vale of Dunan/Riddle of the Portal hybridEdit
For the final challenge on Day 5 of the third heat, a new challenge (taking place at the Vale of Dunan) was used to determine who'd go into the next level of the tournament. The warrior with the most number of lives would go first. They'd take their place at the foot of the path, whilst Raven would stand at the book. When he opened it, the book would speak a riddle to the warrior, who'd have to solve it alone, without Raven's help. Once they got the right answer, they'd walk across the correct letters on the path. But that wasn't the end of the game.
Once they crossed the path, the warrior would have to solve the portal's word puzzle to progress through. They'd examine the text carved above the portal, work out the correct thing to say and speak it into the listening rock. When they got it right, the portal would open, prompting the warrior to walk through and into the final of the tournament.
In season 2, Vale of Dunan was redesigned as Riddle Bridge, and the map symbol was changed from a horizontal view of the letters to a vertical view of the letters (now arranged in rows and columns), with a river running underneath and the riddle book off to the left. The name of the challenge was moved from under the side to above the top of the path.
The format was changed slightly too. On Raven's call forth, the warriors in first and second place would stand at the bridge and at the book, respectively. Raven would produce an hourglass from somewhere inside his cape and show the warriors that that was how much time they'd have to complete the game (this'd be followed by him urging the warriors to work faster). If they didn't start on the path by then, or stepped on an incorrect tile, both would lose a life. If such happened, Raven would call forth the warriors in third and fourth place to replace first and second, respectively. He'd reset his hourglass and start the warriors off. If they lost, and if it was Monday or Tuesday of a heat or final, fifth and six would mount the bridge and book, respectively.
At the end of the bridge were either two, four or six gold rings (either loose (two rings), in twos (four rings) or in threes (six rings)). If first/third/fifth warrior successfully crossed the path successfully and took half the gold for himself, second/fourth/sixth warrior would follow in his path and take the rest of the gold. The other warriors (if any) would follow in the path (Raven presumably flew over it, the lucky bastard).
If all the warriors got the riddle wrong, Raven would resurrect them, take a life from them, give a drole remark to them and turn to the book for the answer. It'd say "The answer is..." and the correct path on the bridge would be illuminated.
Riddle Path Edit
In season 8, with the move to Aviemore, Riddle Bridge was re-christened Riddle Path and given a new map symbol.
In the DVD game of the show, Riddle Bridge is played by the viewer at home. The rules are the same, except asking for the riddle again (by moving the cursor to the book) would automatically reset the timer.