Games like Eternal Challenger
Games like Eternal Challenger include CULTIC, COMPOUND, Warhammer 40,000: Boltgun, Battlefield™ 2042, and STRAFE: Gold Edition. We matched them by the tags players give Eternal Challenger on Steam (Action, Shooter, Boomer Shooter, Roguelite, and 3D): closest matches first, and among equally close ones the better-known games.

CULTIC
Shared: Boomer Shooter · Shooter · Action

COMPOUND
Shared: Action · Roguelite · Shooter

Warhammer 40,000: Boltgun
Shared: Boomer Shooter · Shooter · Action

Battlefield™ 2042
Shared: Shooter · Action · First-Person

STRAFE: Gold Edition
Shared: Action · Shooter · Roguelite

BioShock Infinite
Shared: Action · Shooter · First-Person

Turbo Overkill
Shared: Action · Boomer Shooter · Shooter

Deadzone: Rogue
Shared: Roguelite · Shooter · First-Person

Serious Sam: Siberian Mayhem
Shared: Action · Boomer Shooter · Shooter

Deep Rock Galactic
Shared: Shooter · Procedural Generation · Action

Call of Duty®
Shared: Shooter · Action · First-Person

Ziggurat
Shared: Action · Shooter · Roguelite

DUSK
Shared: Boomer Shooter · Shooter · Retro

Forgive Me Father
Shared: Boomer Shooter · Action · Shooter

ULTRAKILL
Shared: Boomer Shooter · Shooter · Retro

HROT
Shared: Boomer Shooter · Shooter · Action

MOUSE: P.I. For Hire
Shared: Action · Boomer Shooter · First-Person

SharpShooter3D
Shared: Boomer Shooter · Action · Shooter

Deep Rock Galactic: Rogue Core
Shared: Roguelite · Shooter · Action

Titanfall® 2
Shared: Shooter · Action · First-Person

Selaco
Shared: Shooter · Action · Boomer Shooter

Immortal Redneck
Shared: Boomer Shooter · Action · Roguelite

Gunfire Reborn
Shared: Roguelite · Action · Shooter

Risk of Rain 2
Shared: Action · Roguelite · Shooter