What kind of game plate does my grandson need in order to play Disney infinity on his Xbox...

A descrição do jogo não significa que a base seja necessária:

Descrição

"Você já possui o Disney Infinity 1.0 ou 2.0 e quer jogar Disney Infinity 3.0? Traga a aventura! Você pode comprar o software de videogame Disney Infinity 3.0 como um download digital e desbloquear imediatamente o Disney Infinity 3.0 Toy Box. Criar histórias
e aventuras divertidas com novos personagens e poderes!

Esta compra inclui apenas o Software de jogos de vídeo do Disney Infinity 3.0. Por favor, note que uma plataforma compatível com a Disney Infinity Base e um mínimo de 1 Disney Infinity Figure é necessária para jogar. A Disney Infinity Base está disponível
apenas nos pacotes iniciais Disney Infinity Starter Packs ou nos Disney Infinity 2.0 Toy Box Combo Packs. Para mais detalhes sobre a compatibilidade do Disney Infinity Base, visite Disney.com/Infinity.

Você precisaria comprar a base para continuar jogando ou solicitar um reembolso.
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[Mod Translation - The description of the game does not mean that the base is needed:

description

"You already have Disney Infinity 1.0 or 2.0 and you want to play Disney Infinity 3.0? Bring adventure! You can buy Disney Infinity 3.0 video game software as a digital download and instantly unlock the Disney
Infinity 3.0 Toy Box. with new characters and powers!

This purchase only includes the Disney Infinity 3.0 Video Game Software.
Please note that a platform compatible with the Disney Infinity Base and a minimum of 1 Disney Infinity Figure is required to play.
The Disney Infinity Base is available only in the initial Disney Infinity Starter Packs or in the Disney Infinity 2.0 Toy Box Combo Packs.
For more details on Disney Infinity Base compatibility, visit Disney.com/Infinity.

You would need to purchase the base to continue playing or request a refund.]

This is what you need to know:

Xbox one and xbox x|s you can play it on and a lot of other games on (this is like a pc)

Xbox one series x|s and xbox one x|s you can’t play Disney infinity and other games on like Skyrim on. (This is like a Mac)

For another example is for computers the ones that are like a pc can play lots of more games the Mac ones can’t because they can’t play 32 bit games those are like Disney infinity and Skyrim so you need the pc ones

Are you talking about Disney infinity? If so, the 1st one does not work on the Xbox One, it will only work on the Xbox 360. The 2nd and 3rd games require the Xbox One game and platform for them to work. As these games are not longer supported by Disney,
you may have to start worlds again, due to not being able to access the online servers anymore.

There is a Q&A on here if you need more support.
https://appsupport.disney.com/hc/en-us/sections/360000126606-Disney-Infinity-3-0

Minecraft at the moment does like playing lego batman. Its his birthday October 7th and I have got him Disney Infinity

^that's kind of what I was thinking when Disney Infinity was released. Skylanders was too big for people to want to collect both imo.