Horse Isle is a browser-based massively multiplayer online role-playing game (MMORPG) first released in 2007.

This was followed by the released of Horse Isle 3: Infinite Wilds in August 2019, a downloadable three-dimensional edition of the game.

The game offers a number of different horse breeds, mini-games and arena competitions for players to take part in;[2] many of the minigames feature educational elements, focusing on mathematics, science and problem-solving.

The main feature of the game included being able to catch wild horses, then train them to higher stats to win competitions which would reward the player with money or get them onto global leaderboards.

These isles often had exclusive resources or horse breeds that were coveted (such as the pegasus which could fly, greatly reducing travel costs).

In 2020, following the end of support for Adobe Flash Player in most browsers and its subsequent demise, Horse Isle 1 became the victim of a number of hacks, with the game's data became highly compromised and eventually unplayable,[specify] beginning in June and taking place periodically until October of that year, at which point the game was declared unsustainable and was labelled "end-of-life".

Horse Isle 2 featured an enlarged version of the original map, introducing many new 'isles' and towns for players to visit.

Several elements of the original game were retained, including the ability to find and catch wild horses, quests given by NPCs, mining for valuable gems, and puzzles and riddles scattered around the world for players to complete.

Development began in 2018, with several rounds of beta testing taking place in early- to mid-2019, undertaken by staff and volunteer players from the first two games.