Yu-Gi-Oh! Nightmare Troubadour is a video game developed and published by Japanese company Konami back in 2005, exclusively for the Nintendo DS handheld console, part of the highly successful Yu-Gi-Oh! series of games, which is based on popular anime and manga franchise from Japan and continues from the Virtual World arc in the anime, following the Battle City plot line.
The gameplay of Yu-Gi-Oh! Nightmare Troubadour is pretty much the same as any other Yu-Gi-Oh! title released before it in the long-running series, as the player needs to collect unique cards with monsters or other creatures imprinted on them and then fight against opponents and enemies in special duels in order to prove his worth, but also introduces new control schemes using the DS' special features, like the touchscreen, and cards from the Egyptian God sets, which didn't appear in other titles from the series
Win the Expert Cup. The Password Machine can now be accessed in the Duel Shop by tapping the slot machine on the left. The Password Machine allows you to type in the ID number of a card you have and insert it into the game (for 1000 KC). Passwords will only work if you have obtained at least 80% of the pack it comes in (you have the card list) or the card is on your card list (total). You can only get one copy of a card, and no God cards.