The best alternatives to Numogy are TwoDots, twofold inc., and InternetCaching. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Numogy?
Intercom for Startups— Advanced AI-powered features at a 90% discount
Internetcaching is an internet based game in which participants hide and seek objects anywhere on the internet in exchange of points or rewards. Most internet caches require web development skills to solve, create or find the caches.
Make a perfect track using all the pieces. The harder the level, the more ways to solve. Handcrafted levels, each a pen & ink style love letter to mini dioramas and trains. A neat 3D effect makes the game naturally POP when holding your phone!