In Umbra Via, players try free missing pieces of their soul from mysterious shadows by collecting all of their soul flowers. The game combines auction and area control mechanics. Players bid for game tiles during a two-round bidding phase, then place the tiles they won in the bids on the board to create pathways. When a pathway is closed, the player with the most tokens on that pathway liberates some of their soul flowers. The first player to liberate all of their soul flowers wins the game, but the more soul flowers they collect, the harder it becomes to gain control of the pathways.

Umbra Via includes 1 main board, 1 altar board, 4 player screens, 4 bidding boards, 4 cloth bags, 24 tiles, 200 wooden flower tokens, and 4 placement order counters. The game is intended for 2 to 4 players and takes about half an hour to play.