[ - Bakugan: The Old Era - ]

One day, unusual cards rained down on Earth through a dimensional hole. The children collected them and found out that each card contained a giant, hungry for battle monster, bakugan. Children instantly came up with a strategy game. Bakugan only acquired its real height and abilities during the game. The cards contained abilities and bonuses for bakugans, which were necessary in battle to increase the special power of G. People called this game "Bakugan".

The story takes place in a 2014, America, New York city.

Bakugan (race) - In their natural form, bakugan are huge creatures like humans, animals, or mythical creatures. Their color and external attributes depend on the element and purpose (for example, non-combat bakugans have rounded features and no attacking features). Bakugan can also be in the form of a sphere, while maintaining common external characteristics. Interestingly, the bakugan sphere is weakly subject to Earth's gravity and can hardly move in Terrestrial conditions. The Bakugan takes its true form only when the spatial structure corresponds to the structure of the Vestroia on the field. All bakugans are divided into six elements, but there are exceptions: white bakugans without elements and hybrids capable of using several elements at once. Combat skills are also influenced by physical characteristics, the availability of equipment and maps.

Elements are giving bakugans unique coloring: Pyrus - Fire - red, orange, white and yellow colors with green eyes. Aquos - Water - blue, light blue, dark blue, green and black colors with red eyes. Chaos - Light - white, yellow, with light blue eyes. Darkus - Darkness - black, purple, red, grey, with yellow or red eyes. Subterra - Earth - brown, light brown, green, yellow, with red or yellow eyes. Ventus - Wind - green, light green, yellow, light yellow with yellow or red eyes.

Field / Play Field. To open a play field, a two or more people should hold a gate card in front of themselves and say "field, open!". When this action is performed, the time around the entire world will freeze, teleporting both participants into a place between Earth and Vestroia - a giant white baseplate with six (red, green, brown, purple, white, blue) Milky Way-shaped structures that are floating in black air. The field stays open until one or team of participants will lose the fight.

Gate cards: Gate Cards are cards designed to be placed on the battlefield. Once on the gate card, the bakugan changes the shape, transforming from the sphere to its full form. Gate cards are divided by type into cards of elements, properties and team cards. Gate cards are highlighted in the color of their element. When a player throws a regular gate card onto the field, it increases in size and becomes a fight zone. Towards the end of the season, the gate cards begin to become invisible on the field, but retain its effects.

There are 3 rounds on each side.

1. The gate cards are pre-assigned to open the field of play. Once gate card is placed onto the field, it becomes x100 times bigger than before, making it big enough for two or more bakugan to stand on it.
2. After first two gate cards are thrown, the players are playing turn-by-turn. During their first turn, players ALWAYS throw in their bakugans onto any of the gate cards. After first two bakugan are thrown into the fight, during their turn a player can choose to throw another gate card onto the field, or throw a bakugan onto the gate card, or activate ability card.
3. Only 3 bakugans and 3 gate cards can be used per one person in the team during the game, so you'll have to choose wisely before using your bakugans.
4. If two bakugans are standing on the same gate card, the battle starts. Bakugan with the higher G-force wins. However, the outcome of the fight can be changed by using ability card or opening a gate card. Only 3 ability cards can be used per fight.
5. If a player loses all 3 rounds, he loses. Both players are transferred back to where they started the fight, and time flow returns to normal.

Ability cards: To activate the ability card, a player must throw a card onto the field or just hold it in their hand. During activation, the ability shines with the color of its element, and then disappears. Ability cards can be connected to one of the six elements or to the bakugan that was thrown onto the battlefield.