Is BOMBANANA! Cross Platform?

Short answer: crossplay barely applies yet, because BOMBANANA! launched on a single storefront. Here is exactly what is confirmed and what is not.

What Is Confirmed

• BOMBANANA! is a Steam (PC) game — Windows, with macOS listed for the demo and full-game PC listing. Windows and Mac players buying on Steam are on the same platform ecosystem; the game is online co-op for exactly three players via Steam lobbies.
• The Roblox adaptation is a separate product developed by FXFX Studio in partnership with the original team.

What Is Not Confirmed

• Steam ↔ Roblox crossplay: Unconfirmed — and unlikely. The Roblox version is an adaptation, not a port; no source documents shared lobbies or cross-play between the two. Treat them as separate games with the same premise.
• Console crossplay: moot — there are no PS5, Xbox or Switch versions at all, so there is nothing to cross with.
• Steam Deck ↔ PC: not a crossplay question (Deck is a PC), but see the Steam Deck page for compatibility status.

Practical Advice for Mixed Teams

If your squad of three is split across devices:

1. Everyone on Steam PC (Windows or Mac) is the safe, confirmed route.
2. A teammate on Roblox cannot join your Steam lobby based on any public evidence — plan for everyone to buy (or demo) the same version.
3. Watch the official Steam page and Lefto Studio announcements; with consoles unannounced, crossplay news would most likely arrive alongside a console port — and none exists yet.

Related

• Platform availability table
• How to set up a 3-player lobby
• Price and where to buy

Sources: bombananaguide.online FAQ, bombanana.org FAQ, Medal.tv Roblox adaptation page. No public source documents any crossplay feature — that absence is why this page is mostly Unconfirmed.