Touch de Rakushou! Pachislo Sengen: Rio de Carnival official website.
"Pachislo Sengen" (or "Pachislo
t Sengen") is a series of casino games from Tecmo. There have been three of them on the PS2 in Japan.
"Pachislo" refers to pachinko and slot machines, popular in Japanese casinos.
"Sengen" means proclamation, or announcement.
"Rio de Carnival" is an extra mode that was added, where you play blackjack against a sexy dealer named Rio.
"Touch de Rakushou!" was added for this DS version, and near as I can tell means "Touch for Easy Victory!"
Basically it's a casino game, but your objective is to win sexy pictures of the girls at the casino, since you can't exactly win money from a videogame.
This DS version appears to have done away with the pachinko and slot machines, and is just sticking with blackjack, since Rio apparently turned out to be the game's most popular character in Japan.
Touchscreen mini-games include a "spot the differences" game as an image scrolls by on both screens (demonstrated in flash form on the website), and card/photos you can "scratch" to reveal, like those instant-win lottery tickets.
If you're interested, you're probably going to have to import this one, as it seems extremely obvious that this game will never appear in America, especially not on the Nintendo DS, despite all of Nintendo's "Touching Is Good" advertisements, because they were just a mean lie...