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Gate Cards, formerly Gateway Cards, are the playing surface used for Bakugan game. The cards contain a magnetic plate in their middle which triggers the Bakugan rolled onto them to open ("Stand").
Originally, Gate Cards appeared in the HSP format, presented in four main types:
- Normal Gate Card - Those Gate Cards only modified power of your Bakugan, without doing anything else. Usually had around 250-400 HSP.
- Character Card - Just like the normal cards, those did provide extra power to Bakugan of the specific type, while having lower HSP value - from 150 to 250.
- Command Card - Similarly to the character cards, Command Cards gave extra power and had other feature, this time being unique to each card effect, that could've turn the game into an unexpected path. Had HSP value between normal and character cards - 200 or 250.
- Special Ability Card - The most powerful, but least valuable cards. Unlike any other cards, they only have effect, that may change the game entirely, like reviving lost Bakugan, freeze the battle or make enemy return Gate Cards they won to the field. Those cards never had more more than 150 HSP.
Gate Cards (Series 2 rules) come in three colors:
- Gold Gate Cards: Provide additional bonuses based on type of Bakugan. They replaced the original Character Cards.
- Silver Gate Cards: Basic Gate Cards. They replaced the original Normal Cards.
- Copper Gate Cards (sometimes called Bronze): Gate Cards with unusual abilities. They replaced the original Command Cards.
Cards may be Common or Rare, and there are special cards only available in the Arena product.
Gold Gate Cards
Gold Gate Cards often give a Bakugan a G-Power bonus once a certain condition is filled. Many of these cards are Bakugan-specific, meaning that if you want them to work properly, you should at least stock one of the stated Bakugan on the Gate Card (the name of the Bakugan will usually be the name of the Gate Card).
These cards replace the Bakugan Character Cards from the original series.
Silver Gate Cards
Silver Gate Cards are a type of Gate Card framed in Silver. They are the most basic Gate Cards and only a few of them have text. When looking for these cards it is important not only to consider putting in a Gate Card that give you a high boost, but also not so great boosts for your opponent.
Copper Gate Cards
Copper Gate Cards, (sometimes called Bronze Gate Cards), are a type of Gate Card that you can only have one of in the game. These cards have a variety of different effects and they are very valuable in the game. Many of them are helpful to Bakugan with low G-Power but high G-Power Bakugan can make use of Copper cards as well. These cards can change the game for you and easily put you back in the game if your losing by maybe giving you an Ability Card or letting you win an easy round. Copper cards are very valuable in game so choose wisely. These cards replaced the Command Cards from the original series.
- These cards have changed color shade each season, except for season 1 to 2.
In Bakugan Dimensions, Gate Cards are special Moves that set special conditions over the field. They dispel any Gate Cards before it when played and usually last about as long as the typical defense. (Darkus Gates are an exception to this rule as they will only dispel non-Darkus Gate in play, rather than dispel all Gates period. This means you can have multiple Darkus Gates in play at once.)
Highlighted Gate Bonus
Gate Cards have one of their Gate bonuses circled with a bright yellow marking. This is called the "Highlighted Gate bonus". If a player is using a Pearl or BakuFrost Bakugan, they may choose to take the Highlighted Gate bonus instead of their Bakugan's normal Attribute bonus. Additionally, the Bakugan White Naga always takes the Highlighted Gate bonus, as it has no inherent Attribute. The Highlighted Gate bonus provides no other extra effects. 
Gate Cards were originally omitted in the Reboot in favor of BakuCores. However, in the second season, Bakugan: Armored Alliance, the majority of products include a Gate Trainer, which is not used in the game and is instead used for practicing trick shots. Each Gate Trainer has artwork of one of the Awesome Brawlers on the back. The primary reason for the inclusion of the Gate Trainers is to prevent the actual cards from being bent or otherwise damaged in the packaging.
Midway through the season, the Gate Trainers were replaced with actual Gate Cards, which are used for the Gate Battling Game, a simpler version of the normal Toy Battling Game. Gate Cards no longer have names or effects, and simply feature the Faction bonuses and artwork as well as a colored boarder in a similar layout to the Legacy series. Some Gate Cards also have a either a Baku-Gear Symbol or a Faction Fusion Symbol in the lower left corner.
Gate Card Sets
There are currently five Gate Card sets.
- Pictures from some Gate Cards have been used on various other Gate Cards. (Legacy)