Walk a loop board against three AI rivals, but here every unowned property triggers a mandatory sealed-bid auction, you win lots by out-reading opponents, not by landing on them.
Roll to move around the board. Whenever someone lands on an unowned property it opens a sealed-bid auction: every player secretly names a maximum, the highest valid bid wins, and the winner pays just over the runner-up. Collect colour groups to build houses and charge bigger rent. Drive the AI rivals into bankruptcy, or own the most when the dust settles.
Deedlock rebuilds the property-trading board game around mandatory sealed-bid auctions, teaching strategy and valuation.
Opening a sealed-bid auction whenever a player lands on unowned property replaces the usual fixed price with a market one.
Every player naming a secret maximum is the original mechanism.
A first-price sealed-bid auction has a well-known problem: the winner pays their own bid, so bidding your true value guarantees zero profit and everyone shades downward. That makes the interesting question not what a property is worth but what you think others think it is worth.
Deedlock is an original free browser take on the property-trading board game, rebuilt around a mandatory sealed-bid auction for every tile so skill in valuation beats luck of the roll. Made in-house for PlayPendium.