The official 1.0 FAQ says Tetramon is built for NPC opponents and has no near-term multiplayer plans. The Steam listing identifies the game as single-player.

What NPC duels mean
The customer waiting at a play table is an in-game opponent. Personal participation in a tournament is also not the same thing as online competitive matchmaking.
Follow the Tetramon starting guide for the actual 1.0 path to a duel.
Check mod claims separately
Before following a co-op tutorial, identify the exact mod, its original author, supported platform and supported game build. A feature shown in a modified PC installation should not be promised to console players.
This site does not host mod binaries or provide a verified mod compatibility matrix. Back up your saves, follow the author’s installation instructions and do not download a repack from an unrelated mirror.
Cross-save is a different question
The launch FAQ also states that console-to-Steam cross-save is not available. Cloud saving on one platform does not establish cross-platform save support.
Check the developer’s current FAQ before planning a purchase around transferring progress or playing with friends. The answer on this page was source-reviewed on September 16, 2026.
Good questions. Clear answers.
Can I duel my friends in the original 1.0 game?
The official FAQ describes NPC duels, not player-versus-player duels.
Does Steam Cloud mean console cross-save?
No. The official 1.0 FAQ separately says console-to-Steam cross-save is unavailable.
Source-reviewed . Recommendations are editorial guidance, not in-game benchmark results.
OPNeon Games — 1.0 update and launch FAQ Workbench unlock, playable TCG, Ascension, tournament participation, save transfer and multiplayer status.
TCG Card Shop Simulator — official Steam listing Game identity, management features, single-player classification and PC requirements.