The basics

The Undercity is a browser crime MMO. You start with $500 in your pocket, a base of 5 in every stat and a full energy bar, and you build from there: commit crimes for cash and XP, train your stats, gear up, buy property and businesses, join a gang and fight for the city's districts.

• Cash vs bank. Money in your pocket can be stolen in PvP; money in the bank is 100% safe. Everything you buy is paid from your pocket, so withdrawing is the moment of exposure.
• Energy is the action currency. Max 100 (more with a residence), regenerating 1 point every 3 minutes — empty to full in about 5 hours. It regenerates while you are offline, in jail or in hospital.
• HP only matters in fights. Max HP = 100 + 5 per level (up to level 50) + your Stamina (trained and from gear) + any HP bonus from gear. 1 HP regenerates every 2 minutes. Losing a fight costs HP; hitting 0 sends you to the hospital.
• Player XP and level. Your XP comes from successful crimes only. Going from level L to L+1 costs round(50 × L^1.6) XP. The level cap is 50; XP keeps counting past it for the rankings.
• Stat points. Every level grants 5 stat points (a total budget of 250 at the cap). One training action spends one point.
• Newbie protection. You cannot be attacked or raided while you are under level 5 OR your account is younger than 24 hours. Both conditions must clear before you become a target.
• Everything is decided on the server. Every roll (crime, fight, loot, casino) is seeded and computed in the database — nothing is rolled in your browser, and every timer counts on the server clock.
• Guided tour. The Tutorial button (on Crimes, in the game's Wiki and on your Profile) walks through the whole game on screen, in 6 chapters, pointing at where everything is. A Patch notes sheet has a See tutorial when a change lives somewhere on screen: it takes you to each one. Skip it whenever you want.