Horde Mode (Concept) - Giant Bomb

quot;Horde" is a type of multiplayer game mode in which players battle co-operatively against increasingly difficult waves of computer-controlled enemies.

Gears of War 2 - Wikipedia

What We Want From Gears 6

ArtStation - From Space Horde Mode

Halo 4 Review - Giant Bomb : r/Games

Splatoon's Salmon Run: Fine-Tuned Machine of Industry – Parry

Transformers: Fall of Cybertron Review - Tech-Gaming

Classic Mode (SSBU) - SmashWiki, the Super Smash Bros. wiki

Horde - Mordhau Wiki

Game review: Baldur's Gate (1998) - by George Starostin

Horde Mode Games - Giant Bomb

The 10 best games of 2011 (screenshots) - CNET

There's a decent game somewhere in Plants Vs. Zombies: Garden