Yon (rule)

Yon
Margin time	96
Target points	120
Offsetting	Classic
All clear bonus	+30 Nuisance Puyo sent on next chain. (console Puyo Puyo~n, Box); ; +30 Nuisance Puyo sent on next chain, receive Sun Puyo based on the size of the field-clearing chain. (Pocket Puyo Puyo~n)

Yon rule (よ〜ん, yo~n) refers to the set of rules used in Puyo Puyo~n. It is featured in the console versions of Puyo Puyo~n and Box, with Pocket Puyo Puyo~n using a modified version of the rule.

While Yon rule is currently the only Compile-era rule that has not been used in a fully Sega-developed game, Skill Battle, a primary rule that has appeared in Puyo Puyo Chronicle and Puyo Puyo Tetris 2, appears to borrow many elements from this ruleset, making it a spiritual successor of sorts.

Gameplay

The console and Box implementations of Yon rule use Tsu rule as their base, while Pocket Puyo Puyo~n uses Sun rule as its base.

Super attack

Main article: Super attack

Yon rule's most distinguishing mechanic is the super attack. Super attacks have powerful effects such as temporarily blocking Garbage Puyos or sending Puyos to the opponent. In order to use a super attack, a player must have a certain level of SP and then sacrifice their current pair of Puyos. Each super attack has a different SP charge rate and starting SP value, with charge rate further varying based on the number of previous uses of the super attack. To charge SP, the players must both make a chain, which rises in increments.

Super attacks are tied to characters in Puyo Puyo~n, can be unlocked for any character to use in Pocket Puyo Puyo~n, and are selected individually in Puyo Puyo Box due to the lack of multiple playable characters.

Hanging Puyo speed

When a Puyo pair is placed in a manner that causes one Puyo to be suspended in midair, the pair separates and "gravity" drops the hanging Puyo to the lowest available position. The speed in which this gravity effect resolves is drastically slower in Puyo Puyo~n than in previous Puyo Puyo games. This speed change is not carried over into Pocket Puyo Puyo~n, but is emulated in Puyo Puyo Box's Yon rule.

Drop speed and animation changes

In the console version, Puyos fall at a notably slower rate than in any other rule. Yon rule is also the first rule to feature Puyos that drop smoothly, as opposed to the "half-step" animation method used in previous Puyo Puyo games. Both Pocket Puyo Puyo~n and Puyo Puyo Box revert the automatic drop speed changes; Pocket Puyo Puyo~n also reverts the animation change (and gives the option to use half-steps or full-steps), while Box retains it.

Difficulty levels

Console

In this game, the selected difficulties are shown beneath each character's next pieces.

Very Easy: The player plays with 3 colors. Attack powers are much more powerful.
Easy: The player plays with 3 colors. Attack powers are more powerful.
Normal: The player plays with 4 colors. Attack powers are at regular strength.
Hard: The player plays with 4 colors. Attack powers are weaker.
Very Hard: The player plays with 5 colors. Attack powers are much weaker.

Pocket Puyo Puyo~n

Pocket Puyo Puyo~n's handicap setting is a Nuisance multiplier ranging from x0.1 to x4.0.