What is the cheapest place to buy S.E.M.I. – Side Effects May Include...?

Kinguin at $1.59 — the lowest of the 2 stores we compare for your region. Kinguin is a keyshop: it resells keys, which can be region-locked or a different edition. The cheapest official store is Steam at $7.99. Prices update through the day, so check the table above before buying.

Is S.E.M.I. – Side Effects May Include... free?

No — S.E.M.I. – Side Effects May Include... is a paid game. The cheapest we can find it is $1.59.

Has S.E.M.I. – Side Effects May Include... ever been cheaper?

Not since September 2026 — the current price matches the lowest we have tracked in that time, $1.59.

Can I play S.E.M.I. – Side Effects May Include... on Mac?

Not natively — Steam lists no macOS version of S.E.M.I. – Side Effects May Include.... Mac players would need a cloud gaming service or a Windows compatibility layer.

Does S.E.M.I. – Side Effects May Include... have co-op?

Yes — Steam lists S.E.M.I. – Side Effects May Include... with online co-op.

Is S.E.M.I. – Side Effects May Include... on PC Game Pass?

No — S.E.M.I. – Side Effects May Include... is not on PC Game Pass right now. The best price to buy it right now is $1.59.

S.E.M.I. – Side Effects May Include...

Name: S.E.M.I. – Side Effects May Include...
Brand: Two Horn Unicorn
Availability: InStock

Two Horn Unicorn · January 23, 2026 · Co-op, Platformer, Physics, Multiplayer, Online Co-Op

Buy the S.E.M.I. – Side Effects May Include... key for Steam from Kinguin at $1.59 — the cheapest of 2 stores we compare.

Multiplayer deals Co-op deals Platformer deals

Very Positive86% · 113

Best price

75 Lowest tracked

$1.59-80%

⭐ lowest tracked

Buy at Kinguin

Prices last checked 6 Nov 2026, 22:53 UTC

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Where to buy S.E.M.I. – Side Effects May Include... — official stores

Steam

Standard Edition · Steam

$7.99

Buy

Cheapest S.E.M.I. – Side Effects May Include... keys — keyshops

Keyshops are third-party marketplaces — keys are resold and can be region-locked or a different edition. Check the listing's region & edition before buying.

Kinguin

Standard Edition · Steam

$1.59

Buy

S.E.M.I. – Side Effects May Include... price by region

S.E.M.I. – Side Effects May Include... costs £1.04 in the United Kingdom, €1.20 in Europe (EUR), $1.59 in the United States, $1.59 in Georgia (USD), zł6.70 in Poland, CA$10.49 in Canada, A$11.79 in Australia, NZ$11.79 in New Zealand and R$19.99 in Brazil right now.

Cheapest S.E.M.I. – Side Effects May Include... offer in each region, in local currency
Region	Best price	Official store	Key shop	Stores
United Kingdom	£1.04 −84%	£6.69	£1.04	2
Europe (EUR)	€1.20 −85%	€7.79	€1.20	2
United Statesyour region	$1.59 −80%	$7.99	$1.59	2
Georgia (USD)	$1.59 −47%	$2.99	$1.59	2
Poland	zł6.70 −73%	zł24.99	zł6.70	2
Canada	CA$10.49	CA$10.49	—	1
Australia	A$11.79	A$11.79	—	1
New Zealand	NZ$11.79	NZ$11.79	—	1
Brazil	R$19.99	R$19.99	—	1

Each row is a real price from that region's own stores, not a currency conversion, so the figures are not directly comparable. Switch regions in the header to shop the one you buy in.

Screenshots

About S.E.M.I. – Side Effects May Include...

✦ AI summary

S.E.M.I. – Side Effects May Include... is a chaotic cooperative escape game where you and up to three friends fight through a mental clinic filled with puzzles, combat, and brutal platforming while wielding randomized pill-based abilities that range from helpful to hilariously uncontrollable. Wildly unpredictable power-ups, dynamically generated rooms with shifting gravity and deadly traps, and the constant threat of your own team becoming your worst enemy make every escape attempt a frantic test of communication and improvisation.

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!

S.E.M.I. – Side Effects May Include... — game info

Platforms: Windows
Player modes: Single-player, Online co-op
Controller: Full controller support
PC Game Pass: Not included

More games like this:Games with full controller support

Price alert

Get notified the moment the price hits your target.

S.E.M.I. – Side Effects May Include... price history

S.E.M.I. – Side Effects May Include... is $1.59 at Kinguin right now, compared across 2 stores. That matches the lowest price we have tracked.

2026-09-26low $1.59 · now $1.59

Fair price — It's at (or within 3% of) its lowest tracked price.

S.E.M.I. – Side Effects May Include... price changes · since 26 Sep 2026
Date	Price	Store
5 Nov 2026	$1.59 ▼	Kinguin
4 Nov 2026	$7.99 ▲	Steam
1 Nov 2026	$1.59 ▼	Kinguin
26 Sep 2026	$7.99	—

Embed this price on your site

A live price and history chart for S.E.M.I. – Side Effects May Include..., updating on its own. Free to use anywhere — it carries a link back here and needs nothing else.

S.E.M.I. – Side Effects May Include... — questions & answers

What is the cheapest place to buy S.E.M.I. – Side Effects May Include...?: Kinguin at $1.59 — the lowest of the 2 stores we compare for your region. Kinguin is a keyshop: it resells keys, which can be region-locked or a different edition. The cheapest official store is Steam at $7.99. Prices update through the day, so check the table above before buying.
Is S.E.M.I. – Side Effects May Include... free?: No — S.E.M.I. – Side Effects May Include... is a paid game. The cheapest we can find it is $1.59.
Has S.E.M.I. – Side Effects May Include... ever been cheaper?: Not since September 2026 — the current price matches the lowest we have tracked in that time, $1.59.
Is S.E.M.I. – Side Effects May Include... worth buying now?: Fair price. It's at (or within 3% of) its lowest tracked price.
Can I play S.E.M.I. – Side Effects May Include... on Mac?: Not natively — Steam lists no macOS version of S.E.M.I. – Side Effects May Include.... Mac players would need a cloud gaming service or a Windows compatibility layer.
Does S.E.M.I. – Side Effects May Include... have co-op?: Yes — Steam lists S.E.M.I. – Side Effects May Include... with online co-op.
Is S.E.M.I. – Side Effects May Include... on PC Game Pass?: No — S.E.M.I. – Side Effects May Include... is not on PC Game Pass right now. The best price to buy it right now is $1.59.

DLC & expansions

🎁 Complete the collection

Base game + 1 of 1 DLC at today's best prices.

$3.58

to own everything

S.E.M.I. – Side Effects May Include: Digital Artbook

from$1.99

lowest tracked $1.19

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Recommended Jul 17, 2026

определённо да, игра весит всего гигабайт но играется с полным угаром из миинусов оптимизация игра хоть и весит мало но извините, фпсов не хватает а так в целом охуительно

Recommended May 14, 2026

So fun game to play with friends. U actually have to use brain. The only real issue I had was motion blur. If you have it turned off, it still feels on at times, which can grate during fast motion. I just hope the devs take it out completely in an update. Overall, a very fun co-op game 8/10

Recommended Apr 25, 2026

I honestly love how goofy this game is. It is so much fun! I love the different 'side effects' and the customisation of the characters. The puzzles are funny too, I don't find them stressful. All in all I find this is a nice chill game!

Recommended Mar 31, 2026

[h1]Weird but Fun Platformer![/h1] This one was definitely fun with friends. We did have someone who wasn't the best at platformers, but think we all enjoyed it! The Puzzles were challenging and the effects from the "medicines" had some interesting effects. I'd recommend if you want a game to play with a group of friends!

Recommended Mar 22, 2026

This game is pure chaos. Its a lot of fun with close friends. The pill side effects are hysterical and the puzzles are interesting enough that you can get stuck. The way you are downed is so stupid and funny we spent to much time just hurting each other. 10/10 game experience.

Recommended Mar 13, 2026

Played this with my wife and we had a surprisingly good time. It can be a bit difficult at first, but that actually makes it more satisfying once you get the hang of it. The overall theme of the game is completely crazy (sorry… couldn’t resist the pun 😅), and the unpredictable abilities and side effects make every run feel chaotic in a fun way. I really like the customization options and the general design of the game. The art style and characters are pretty cool, and unlocking new outfits and decorations adds a nice extra layer to the experience. The idea behind the game is also quite original. Running through rooms, dealing with traps, fighting enemies, and dealing with random pill side effects keeps things unpredictable and entertaining the whole time. The levels and challenges keep you busy and engaged, especially when playing together. Overall, a fun and weird co-op experience that’s great to play with friends or your partner.

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