It's really a simple game. Here's a brief translation of the rules from the site. Otherwise, I might as well just make a FAQ out of it...
As Himiko said, visit the
site to see the rules and screenshots.
1. Choose your character. Each character has their own "super power" and deck. They happen every now and then during your turn.
2. Pick a map. Choose an LM ("Linkage Map", the numbered grey squares) and then link it to one of the available stages.
3. Set the conditions for clearing the map. How many stars to collect.
4. Set your "Summon Dice". 1 side of your dice is called the "Star Face" which means any card you set on it is more likely to appear than the other 5 faces. Set this by using the 'S' button as in the screenshot. The other 5 phases are called the "Common Face" and you use the next button to set these.
5. Roll your "Summon Dice". Do this by using the middle button in screenshot 4. Number of stars determine the number of squares your mascot moves. Hitting A repeatedly while the dice rolls increases your chances of the Star Face appearing.
6. Duels. If you encounter a monster or another player, you will duel with the card you ended up with after the roll. In the duel, the dice will determine who will win. If you win, you gain the number of stars you have on your card.
7. Aim for your goal. Lose all your LP during duels means you lose.
Voila