As most games-of-chance Xoia Classic is based on betting [virtual coins] on the occurrence of certain events - in this case a player bets on jewels to have them arranged into lines of 3 - 7 symbols long. Paying back lines can run in all 4 directions: horizontal, vertical, diagonal and antidiagonal. Filling the 7 by 7 Board with rows of jewels is called a "game". Unique gameplay experience is achieved by two factors: 1 - the player can end a single game and collect his winnings at any given moment if he dislikes the arrangement of jewels; and 2 - player can modify his bet while playing. This mechanism along with unique properties of every jewel [frequency, return rate] incorporates elements of a logical game into a plain and intelligible game of chance. Since you do not need advanced mathematics to alter your fate in Xoia Classic an intermediate player will easily assess profitability of his moves but you don't have to "count all cards" to have fun. As experience grows the player unlocks more functionalities such as: special bets to multiply your original bet by hundreds of thousands times, or additional big wins for special line combinations. Moreover Xoia offers over 40 unique Achievements most of which are connected with a considerable prize. Thanks to the system of free bonus coins that are ready to collect every 4h and increase their value with every collection and XP level, players can have fun without any additional payments.