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Instead of testing for a gamemode NBT tag, why don't you use the gamemode selector instead?

/testfor @a[gamemode=adventure]

If you want to mark players, you can use a /scoreboard command with the selectors set to @a[gamemode=adventure].

Before 1.13, it is @a[m=2], but as of 1.13, m was renamed to gamemode and the argument is now the name of the mode.

Props to @ppperry for notifying me of this.

Instead of testing for a gamemode NBT tag, why don't you use the gamemode selector instead?

/execute if entity @a[gamemode=adventure]

If you want to mark players, you can use a /scoreboard command with the selectors set to @a[gamemode=adventure].

Before 1.13, it is /testfor @a[m=2], but as of 1.13, m was renamed to gamemode, /testfor was renamed to /execute if entity, and the argument is now the name of the mode.

Props to @ppperry for notifying me of this.

Instead of testing for a gamemode NBT tag, why don't you use the gamemode selector instead?

/testfor @a[gamemode=adventure]

If you want to mark players, you can use a /scoreboard command with the selectors set to @a[gamemode=adventure].

Before 1.13, it is @a[m=3], but as of 1.13, m was renamed to gamemode and the argument is now the name of the mode.

Props to @ppperry for notifying me of this.

Instead of testing for a gamemode NBT tag, why don't you use the gamemode selector instead?

/testfor @a[gamemode=adventure]

If you want to mark players, you can use a /scoreboard command with the selectors set to @a[gamemode=adventure].

Before 1.13, it is @a[m=2], but as of 1.13, m was renamed to gamemode and the argument is now the name of the mode.

Props to @ppperry for notifying me of this.

Instead of testing for a gamemode NBT tag, why don't you use the gamemode selector instead?

/testfor @a[m=3]

If you want to mark players, you can use a /scoreboard command with the selectors set to @a[m=3].

Instead of testing for a gamemode NBT tag, why don't you use the gamemode selector instead?

/testfor @a[gamemode=adventure]

If you want to mark players, you can use a /scoreboard command with the selectors set to @a[gamemode=adventure].

Before 1.13, it is @a[m=3], but as of 1.13, m was renamed to gamemode and the argument is now the name of the mode.

Props to @ppperry for notifying me of this.