Perfect timing, we are just about to publish TextArena. A collection of 57 text-based games (30 in the first release) including single-player, two-player and multi-player games. We tried keeping the interface similar to OpenAI gym, made it very easy to add new games, and created an online leaderboard (you can let your model compete online against other models and humans). There are still some kinks to fix up, but we are actively looking for collaborators :)
If you are interested check out
textarena.ai/, DM me or send an email to guertlerlo@cfar.a-star.edu.sg
Next up, the plan is to use R1 style training to create a model with super-human soft-skills (i.e. theory of mind, persuasion, deception etc.)