A Dungeon crawling, Pokémon Go style, location based game that relies more on your phone's built in gyroscope/pedometer, rather than your GPS or Google Maps.
Say you keep it running through out the day, and the game "back logs" your steps. When you're done on your walk, on break at work, or finished exercising you pull out your phone and how many steps you took that day is how far you pergressed in the "dungeon."
Let's say you walked 1,000 steps, and each room in the dungeon is 100 steps long, that would mean you've progressed 10 rooms. (None of these numbers are final, multiples of 10 are just easy to work with.) Each room has an increasing percentile chance to have an encounter. For every empty room, that percintile increases to better the odds of the next room holding an encounter.
Encounters in this game would be a lot like encounters in Magicarp Jump, where you can possibly out right ignore some, or risk a positive or negative outcome, such as gaining more steps to progress further in the dungeon, or loose steps and miss out on a room, nothing too drastic that would dissuade you from wanting to play or walk. For example, "On your Journey you find a chest atop a stone pedestal, dare you open it?" and you would either loot the chest and gain more steps, risk it being a mimic and loosing steps, or just pass through the room, leaving the chest behind.
A game is no fun without a challenge, I have not yet determined how or even if full fledged combat would be a thing. Perhaps items that increase your stats, whatever they may be. Maybe boots that add an additional .25% steps per step. Maybe varying levels of stats and/or skills can provide you with different options for encounters, a trap blocks your path? You may spend steps to disarm it, unless you have a trap skill, or with high enough strength, attempt to brute force your way through it to either progress through the room without loosing steps, or risk getting trapped, and spend more steps trying to get out of the trap than if you'd of disarmed it.
I think it'd be a neat idea for a game. The whole idea came about when I wanted to play pokémon go, but I dont have immediate access to internet at all times, and I started thinking about gyroscopes, and how fun DnD is, but I am not at all a game developer or designer, might not even be possible, or as fun as I'd think it'd be, I wanna know what other people think of an idea like this, could be cool to hear other ideas