What are some alternatives?
When comparing Marvel Heroes and Spiral Knights, you can also consider the following products
Drakensang - Drakensang is a Single-player, Third-person, Role-playing and Adventure-based Combat video game created by Radon Labs and published by DTP Entertainment.
World of Warcraft - A companion app for the popular massively multiplayer online game, the World of Warcraft App allows subscribers to manage their class hall missions while on the go. Read more about World of Warcraft.
Titan Quest - Titan Quest Anniversary Edition Titan Quest is back! Nordic Games (now: THQ Nordic) acquired Titan Quest in 2013 from THQ and started to work on bringing back the multiplayer and improving the game further.
Guild Wars 2 - Guild Wars 2 seeks to change the face of Massively Multiplayer Online Games.
NieR: Automata - NieR: Automata is an Action-Adventure, Role-playing, Combat, Fast-paced and Single-player video game created by PlatinumGames published by Square Enix.
Dragonica - Dragonica is a 3D, Massively Multiplayer Online, Role Playing and Fantasy-based video game created by Gravity and published by gPotato Europe.