MONOWAVE is a puzzle adventure through colorful worlds powered by four emotions. Alone or with a friend, express your feelings through song, empathize with your
MONOWAVE is on Steam in Early Access at $8.99, with a 10% launch discount at the time of writing. It is a puzzle adventure built around four emotions, playable alone or with a friend.

MONOWAVE runs on four emotions
Studio BBB describe colourful worlds powered by four emotions, with song as the way you express them. Making feeling the mechanic rather than the theme is the distinctive part — the puzzle solutions are emotional choices, not switches.
The price will likely move at 1.0, as is usual for Early Access releases that arrive below their eventual figure.
Song as an input is rarer than it sounds. Plenty of games use music as reward or atmosphere; far fewer make the act of singing the thing you do to change the world. Where it has been tried the results tend to be memorable rather than merely pleasant, which is the right ambition for a small team.
Games built on this idea succeed or fail on whether the four states genuinely differ in use. If joy and sorrow open the same doors by different names, the concept collapses. If they do not, it is the sort of mechanic people remember.

Co-op is optional, not bolted on
It works solo or with a second player. For a puzzle game that is a design commitment rather than a feature-list item, because every room has to read correctly with one person or two.
Studio BBB do not specify whether that is local or networked, and for this kind of game the distinction matters. Shared-screen co-op suits a puzzle adventure better, so it is worth confirming on the store page before buying for two.
Empathy with spirit friends
MONOWAVE has you empathise with spirit companions to move forward, which suggests a gentle game rather than a taxing one. The Casual tag alongside Adventure supports that reading.

Phoenixx are co-publishing
Phoenixx have a record of picking up small Japanese indie titles and giving them a wider release. Their involvement usually means a game gets more support than a self-published equivalent would.
For a game leaning on an unusual central idea, that backing matters. Concepts like this need polish to land, and polish costs time nobody has when they are funding themselves.
Nine dollars, and Early Access
MONOWAVE is $8.99 at the time of writing. The puzzle count is not final and the co-op may still be rough, which at this price is a reasonable gamble — but a gamble rather than a finished purchase.
At a glance — verified Steam listing
Developer: Studio BBB Inc. · Publishers: Studio BBB Inc., Phoenixx Inc. · Released: 16 September 2026 · Price: $8.99 (10% launch discount at the time of writing) · Genre: Action, Adventure, Casual, Indie · Early Access · View on Steam
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