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Upgrading is a highly popular four-player poker card game in China, where players can choose to play with one deck or two decks of cards.

When playing with one deck, it is also known as "40 points" or "hitting a hundred points"; when using two decks, it is referred to as "80 points".

Playing with two decks is commonly referred to as "Tractor". Just like playing with one deck, the game involves four players competing in pairs, striving to upgrade their score. The basic rules are similar to those of "Upgrading", characterized by simplicity and strong competitive elements. "Tractor" retains the advantages of "Upgrading" while increasing the number of cards from 54 to 108, removing restrictions on scoring based on the remaining cards, thus making the gameplay more dynamic. The introduction of playing styles like "Pairing Up" and "Tractor" (which is how the game gets its name) and rules such as "Double Dig Doubling" enhances entertainment and excitement during gameplay.