Players can cast spells such as summoning meteors, or transforming enemies into sheep. Grenades, which have been a franchise staple, have been replaced with a spell slot on a cooldown. Melee weapons have their own 5th weapon slot to encourage the player to fight up close. The game also features new types of gear for the players to use to improve their strength.

The game features the same procedurally generated loot system from the Borderlands series that is capable of generating numerous combinations of weapons and other gear. Players have a large arsenal of weapons and firearms at their disposal, and for the first time in the series, players can wield melee weapons. The playable avatars have stats that can be upgraded using 'hero points'.

The game features six different character classes, and for the first time in the series, players can mix and match these skills for their characters. In terms of the characters themselves, rather than playing as a specific vault hunter, with their own personality and voice lines, players instead play as a custom made character using the game's character creator system. Tiny Tina's Wonderlands builds upon the standards set by the Borderlands franchise that it originated from while also differing in several key aspects. There are random combat encounters and quests that can only be completed in the overworld. The game features an overworld, which is used by the playable characters to traverse the various locations in the game. The game is set within the world of a fantasy-themed tabletop role-playing game.

The game can be played solo or with up to three other players in online or local split-screen multiplayer. Similar to its predecessors, the game is a first-person shooter with elements of an action role-playing game.

Similar to its predecessors, the weapons in the game are procedurally generated.

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