Ok, i'll explain:
There are 22 boxes with 22 different sums of money in them ranging from 1p to £250,000
These amounts of money are shown on a big game board - there is the blue side (1p-£750) and the red side (£1000-£250,000)
At the start of each game, 1 out of the 22 players are picked at random to come and play DoND.
When the player is picked, they bring their box (all 22 players are assigned a box at random, which contains one of the 22 sums of money in it) to the table and get ready to play.
In the 1st round they have to pick 5 boxes to open, they have to try and pick the lowest possible sum they can.
Each time a box is picked the other players who werent picked to play on this day have to open the box that they were assigned to, when the box is opened, it is eliminated from the game, after 5 boxes, the banker calls.
The banker offers the player a sum of money to walk home with tax free. Depending on how strong the game board is, the player has to decide wether to accept the offer or not.
If they say deal, the game stops but Noel Edmonds still makes the player pick the boxes they would have chosen IF they had carried on.
Most (at this stage of the game) carry on.
In all other rounds, players only have to pick 3 boxes per round instead of 5.
The game carries on until there are 2 boxes left (thats the players OWN box and one other box left on the game board), that is if the player hasnt already said deal to a previous offer from the banker - then they have the option to open their own box and win the sum of money present in their box.
Thats a brief summary of the game, well, as brief as I could