You can get free games for understanding on the site of DuelHunter. You can apply the same strategy, as in duels (this sentence about rates), screenshots in Russian version (Áûêè è êîðîâû). You need to play about 20 games for understanding, and you can play for real money.
More often players guess for 6 courses. Here the probability of a prize is always equal 50% because all gamers have difficult numbers and easy numbers.
