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S.e.m.i. – Side Effects May Include...

Co-opPlatformerPhysicsMultiplayerOnline Co-Op78% positive on Steam

Two Horn UnicornReleased 23 Jan 2026

1 active offer across 1 storePrices updated 48 min ago

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Standard Edition 1 offer · EU & Global

Lowest price
S.E.M.I. – Side Effects May Include PC Steam CD KeyActivation key
SteamGlobal
€1.63Payment fee added at checkout
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Official store Steam · price for Germany

Steam
Steam store pageDirect purchase
SteamGermany
€7.79Official store, no marketplace fee
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Trailer & screenshots

S.e.m.i. – Side Effects May Include... screenshot 1

S.e.m.i. – Side Effects May Include... screenshot 2

S.e.m.i. – Side Effects May Include... screenshot 3

S.e.m.i. – Side Effects May Include... screenshot 4

Price comparison

Buy S.e.m.i. – Side Effects May Include... key: current price comparison

The cheapest S.e.m.i. – Side Effects May Include... key that activates in the EU currently costs €1.63 at Kinguin. Keyfinder compares 1 offer from 1 shop for this price. That is 79% less than the Steam price of €7.79. Prices are refreshed hourly; region, edition and any checkout fees are shown on each offer.

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The details

About S.e.m.i. – Side Effects May Include...

S.E.M.I. is a single-player and co-op action platformer with puzzle elements. Play as patients of an unusual clinic, take experimental drugs, interfere with each other, and be ready for chaos and unpredictable side effects!

Developer: Two Horn Unicorn
Publisher: Two Horn Unicorn
Release date: 23 Jan 2026
Steam: View on Steam