You can discard the Single, Pair, Straight, Flush, Full House, 4-of-a-Kind + Kicker or Straight Flush in the descending order. Please note that each player needs to plays a higher card set or passes.

When the previous player plays the straight, Flush, Full House, 4-of-a-Kind + Kicker or Straight Flush, you can discard the same card to pin him.

Here are the ranks of a set of five cards : Straight Flush > 4-of-a-Kind + Kicker > Full House > Flush > Straight.

Card and Suit Ranks:

Single:
Pair:
Straight:
Flush:
Full House:
4-of-a-Kind + Kicker:
Straight Flush:

How to play Big 2:

Choose the cards: You can press up button to select the cards which you wanna discard. Conversely, if you would like to cancel the cards which you wanna discard, please press the down button.
Discarding: If you have chosen the cards completely, please press the button 1, you will start to enjoy this fun game.
Pass: If you hold no higher cards than the cards discarded by previous player, (or, more likely, wishes to hold onto multiple higher cards for later rounds), please press the button 2 to pass in this round.

The accounting of score:

When 1 player runs out of cards, it shows the game is over. In the meantime, the remaining players will loss their account individually.

Please see the rules of losing account as followed:
If you still hold 5 cards in the end, your account will be lost 5*10=50.
But if you hold more than 10 cards or any poker ranked 2, you will lose the double account.

Update Description:
New features of Big-2 1.20 :
1. Add one more card set 3-of-a-Kind
2. Add an alternative to let user assign either 'Club' or 'Dimond' to be the smallest rank.