Bakugan Wiki:How to Play (Generation 1)/Japanese Version
Contents
The Goal
The goal of the game is to get three Gate Cards in your Used Pile, after which you win the game.
Setup
To begin, each player selects 3 different Bakugan (the same Bakugan with different G-Powers are considered different), 3 Gate Cards and 6 Ability Cards. You can also use Battle Gear and Traps if you have corresponding ability cards in your deck.
Playing the game
To start the game, each player places all their cards, Bakugan and Support Pieces on your right called the Unused Pile. This pile houses every piece that has not been used yet. Gate Cards and Ability Cards are always facedown when in your Unused Pile. There is another pile on your left called your Used Pile, which hold some pieces that has been used.
In a two-player game, each player places one of their Gate Cards face down in the center of the playing field, side to side with your one being placed right to opponent's one.
For each extra player, one of their gate cards is added in front of behind one of ones placed in beginning.
Whenever there are no more Gate Cards on the field, all players lay out Gate Cards as specified in this section.
Rolling
On your turn, you can roll your Bakugan, add new gate card on the field next to, behind or in front of one of gate cards on field and/or play certain Ability Cards (ones that take effect before or after your roll).
You must roll your bakugan from distance of at least 2 gate cards from closest one on the field
If your Bakugan opens on roll and magnet is connected to your card, then your Bakugan performed Stand. If you performed Stand on gate card with your bakugan - you take this card and put it into your Used Pile (aka Winning Slot). This is called Double Stand.
If there is an opponent's Bakugan on the Gate Card, Battle ensues.
If you performed Stand on Gate Card with ally (but not your) Bakugan, Stand fails
If you miss your Bakugan, that Bakugan is placed in your Unused Pile.
In any situation when bakugan loses magnet contact with Gate Card and don't gain it once again, he should be placed in it's owners unused pile. If bakugan was knocked from standing of by opponent's bakugan which isn't Standing after that, that is called Critical Hit. When Bakugan was knocked off from standing of by opponent's bakugan that performed Stand after that, it's called Critical K.O.. Player who did Critical K.O. moves Gate Card on which his bakugan performed Stand to his Used Pile
If all of your Bakugan are on the field and you have no Bakugan in either your Used or Unused piles, then you can pick a Bakugan on the field to "Stay". If your turn comes around and the Bakugan you called "Stay" on is still on the field (ie. a Battle hasn't started yet with that Bakugan) then you get to take Gate Card where it was standing on.
Battle
Battles begin when 2 Bakugan from different players Stand on the same Gate Card. Before the Gate Card is flipped over, players check whether certain Ability Cards can be played. Then, the Gate Card is flipped over, and the card text is read. Then, look at each of the Bakugan's printed G-Powers and add the Gate Attribute bonus that matches your Bakugan's attribute to your Bakugan. After that, players can play Ability Cards from their Unused Piles, starting with the person who created the battle. The Bakugan with the highest G-Power by the end wins the battle. In the event of a tie, the Bakugan who stood on the Gate Card first wins. Gate Cards won in battle go to the winner's Used pile and all Bakugan and Support Pieces go to their owner's Unused Piles after Battle.
Parts in more detail
The Bakugan
Each Bakugan a member of one of six Attributes; 
Pyrus(Fire), 
Subterra(Earth), 
Haos (Light), 
Darkus (Darkness), 
Aquos (Water) and 
Ventus (Wind). Each Bakugan also contains a printed G-Power. This is used in Battle to determine a winner.
Support Pieces
There are two different Support Pieces (Traps and Battle Gears) that can be used alongside your Bakugan. Support Pieces can be used via corresponding ability cards. Traps can be either used as obstacles on the field or give extra Gate Card boost. Battle Gear give huge G-Power boost to the user
The Gate Cards
There are three different types of Gate Cards; 
Copper/Bronze, 
Silver and 
Gold. Each type has a specific style. Gold Gate Cards typically call out for specific attributes or specific Bakugan. Silver Gate Cards usually feature no card text. Bronze/Copper Gate Cards may have various effects.
Ability Cards
There are also three different types of Ability Cards; Red, Green and Blue. Each type has a specific style. Red Ability Cards are typically played during your roll. Blue Ability Cards are typically played during battle. Green Ability Cards vary wildly. Some are played during the roll, some are played during battle, before the Gate Card is revealed, after battle and some are played at any time.
Power Level
Some cards or Support Pieces' Reference Cards contain a Power Level marker on the top right of the card. These cards or Support Pieces cannot be played until the Power Level in the game reaches the number on the card. The Power Level corelates with the total number of Gate Cards in each player's used pile.
