Minecraft wiki entry for Creeper, associated text: In Borderlands 2, creepers appear in a mineshaft in the most north-west part of Caustic Caverns, including dirt, coal ore, stone, gold ore, and a "Badass creeper" that is twice the strength and size of a regular Creeper.
In Airmech, creepers appear as a unit "skin" for the suicide bomber unit the boomer. Creepers can be either green, blue, or red, depending on the color of the team that makes them.
In Octodad: Dadliest Catch, a creeper head is seen on a shelf in the grocery store along with 2 Pickaxes and some grass blocks. It is part of a collection known as "Mintcraft".
In Awesomenauts, one of the playable characters (Clunk) has a "skin" referencing the creeper, complete with hissing and explode sound effects.
A creeper can be seen and interacted with in a level from the game McPixel.
Seen as a Halloween costume in the 2D action-adventure, open-world sandbox / platformer game, Terraria.
In Evoland 2, a game designed as a tribute to many classic games, "Dreaded Creepers" can be found as a mob in The Mine, present era. If the player gets killed by a Dreaded Creeper, they unlock the sssSSSSSss BOOM! achievement.
The Creeper makes various appearances in the crossover fighting game Super Smash Bros. Ultimate, as it appears as a DLC costume for the Mii Brawler, It also appears as a "spirit", and they also appear in Steve's Final Smash, the House of Boom.