Goal: Get rid of all your cards. The last player still holding cards when the deck runs out is the Durak (the loser).

Setup: Each player is dealt 6 cards. One card is drawn from the bottom of the deck to determine the trump biome — that suit beats all others for the entire game.

Card ranks (low → high): 2 3 4 5 6 7 8 9 10 J Q K A
Within the same biome, higher rank always wins. A trump card beats any non-trump card regardless of rank.

Trophic levels:
2–5 → Producers  |  6–8 → Primary Consumers  |  9–10 → Secondary Consumers  |  J–A → Tertiary Consumers

A round:

1. The attacker plays a card face-up on the table.
2. The defender must beat it with a higher card of the same biome, or any trump card.
3. The attacker (and other non-defenders) may keep adding cards, but only if their rank matches a rank already on the table, and only up to the number of cards the defender holds.
4. If the defender beats everything, the cards are discarded and the defender becomes the next attacker.
5. If the defender can't or won't beat a card, they take all cards on the table. The attack passes to the next player.

After each round, all players draw back up to 6 cards (attacker first, defender last).

Winning: Once the deck is empty, players who empty their hand are out. The game ends when only one player remains — that's the Durak.