Should I play Spelunky 2 or Unit 4 first?

If you want chronology, Unit 4 (2017) came out before Spelunky 2 (2020). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.

Are Spelunky 2 and Unit 4 similar?

They overlap on Action, Indie on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.

Do both Spelunky 2 and Unit 4 have co-op?

Yes — both list a co-op category on Steam. Specifics differ: Spelunky 2 ships Online Co-op, Shared/Split Screen Co-op; Unit 4 ships Shared/Split Screen Co-op, Co-op.

Does Spelunky 2 run on Steam Deck?

Yes — Spelunky 2 is rated Deck Verified by Valve. Unit 4 doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.

Spelunky 2 vs Unit 4

Spelunky 2 and Unit 4 both land in Action, Indie on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both share Action, Indie on Steam. Unit 4 (2017) is 3 years older than Spelunky 2 (2020). Unit 4 is currently ~25% cheaper on Steam than Spelunky 2 (14.99 USD vs. 19.99 USD). No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.

Spelunky 2 vs Unit 4 — Steam metadata comparison
	Spelunky 2	Unit 4
Released	2020	2017
Genres	Action, Indie	Action, Indie
Platforms	Windows	Windows
Steam Deck	Deck Verified	Unrated
Price	19.99 USD	14.99 USD
Steam reviews	93.3% positive (13,985 reviews)	7 reviews
Multiplayer	Multi-player, Cross-Platform Multiplayer, Online Co-op	Multi-player, Shared/Split Screen Co-op, Co-op
Developers	Mossmouth, BlitWorks	Gamera Interactive

Side by side

Both share Action, Indie on Steam.
Unit 4 (2017) is 3 years older than Spelunky 2 (2020).
Unit 4 is currently ~25% cheaper on Steam than Spelunky 2 (14.99 USD vs. 19.99 USD).
Both support cooperative play.
Spelunky 2 is Deck Verified on Steam Deck; Unit 4 has no Deck rating yet.

Spelunky 2 vs Unit 4 — FAQ

Should I play Spelunky 2 or Unit 4 first?: If you want chronology, Unit 4 (2017) came out before Spelunky 2 (2020). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
Are Spelunky 2 and Unit 4 similar?: They overlap on Action, Indie on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.
Do both Spelunky 2 and Unit 4 have co-op?: Yes — both list a co-op category on Steam. Specifics differ: Spelunky 2 ships Online Co-op, Shared/Split Screen Co-op; Unit 4 ships Shared/Split Screen Co-op, Co-op.
Does Spelunky 2 run on Steam Deck?: Yes — Spelunky 2 is rated Deck Verified by Valve. Unit 4 doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.

Side-by-side comparison

Side by side

Spelunky 2 vs Unit 4 — FAQ