Invented by Mark Ball, from the channel Riffle Shuffle & Roll, in 2022. It's a good neo-trad solitaire, in both Classic and Advanced modes.
Dungeon Solitaire - Tomb of the Four Kings
A very atmospheric and thrilling game by Matthew Lowes, designed back in 2015. The gameplay is almost totally luck-based, but the theme is crafted so well with the mechanics, that it's not even a problem, but part of its charm.
Gridcannon is a neo-trad solitaire but with a sick purpose: to kill all the royals. Designed by Tom Francis in 2019, it's a game of card placement where you try to match the card sum on the rows and columns with the royal's value.
It is one of the first games in the genre, if not the first. It dates back to 2005 and was created by Luc Miron, that seems to have just made this game and then disappeared.
A collection of ten great solitaires designed by Will Su and released in 2021. All of the games are great fun and masterfully designed, combining themes and mechanics in very creative ways.
Scoundrel is an elegant modern solitaire designed by Zach Gage and Kurt Bieg in 2011. Your goal in this game is to make your way through the dungeon, room after room. As you progress, you will need to defeat enemies, equip weapons and manage the health potions. The game is very cleverly designed and demands a good amount of skill and wit from the player.
Solitary Journey is more an experience than a game. It's an in-hand solitaire where you're travelling across various landscapes collecting treasures and meeting fellow travelers. Designed by Karen Deal Robinson in 2018.
Regicide is a highly acclaimed game, a must-play for any enthusiast of modern trad games. It was designed by Paul Abrahams, Luke Badger and Andy Richdale, released in 2020. It is a cooperative game where your goal is to defeat and overthrown corrupt monarchs in a series of boss fights, and to do so, you have at your disposal an army of rebellious fighters, each with a special ability.