Choose your arena.
Arcade classics, live challenges and competitive tournaments. Each mode has its own space. No clutter.
✦ Launch Neon Arcade →Explore game areas
Choose a mode🟢 Around the Underground
Quick access
Jump straight into your next match or browse the arcade. Press Ctrl/⌘ + K to search.
Trivia showdown
Pass the phone or challenge friends to a quick quiz. No stakes, no downloads.
Ready to play?
10 questions · mixed topics
Friends
Add people, accept requests, and jump into a conversation.
Add a friend
Messages
Your conversations, all in one place. Messages update automatically while open.
Choose a friend to start chatting.
Groups
Create a hangout, join a group and chat together.
Create a group
Blackjack
Try to reach 21 without going over. Play solo or challenge a friend. No betting, chips or real money.
Solo practice
Online with a friend
Both players take turns against the same dealer. Moves sync automatically.
🏆 Mini Tournaments
Four players. Two semifinals. One final. Play Tic-Tac-Toe or Connect Four and crown a winner.
Create a tournament
Online multiplayer
Challenge another member to Tic-Tac-Toe or Connect Four. Moves appear automatically while you play.
✦ The new arcade is live.
Four original minigames. Smooth animations, combo multipliers, touch controls, and personal records.
Personal arcade records are saved locally on each device. No unverified public scoreboards.
Multiplayer standings
Arcade high scores
Community feed
👑 Owner dashboard
Only Henoi can access this dashboard.
Pixel pets
Your theme
Change how Underground+ looks on this device.
Saved locally in this browser.
Listening lounge
Share a music link with friends. Playback happens on the provider site; synchronized playback is not available yet.
⌨ Secret terminal
UNDERGROUND OS 1.0\nType help to begin.