About the 162-0 MLB challenge

84-0's MLB mode is a free browser game where you draft an all-time MLB roster one random draw at a time. Assemble an all-time MLB roster from random draws, then simulate the season and chase an impossible 162-0 record.

Each draw offers players from a random team and era, and you keep exactly one — build the strongest possible lineup, then watch the simulation play out. One loss ends the run, so a true 162-0 season is genuinely rare.

Tips from the community

• Spend your skips early rather than hoarding them, keep roster slots flexible so a late superstar always has a home, and mind era adjustments — a dominant modern season usually beats bigger raw numbers from early eras.
• Study the league leaders after each sim — the engine rewards balanced rosters over one superstar.
• Signed-in runs count toward weekly and monthly leaderboard prizes.

Full rules, records and strategy live in the Go Undefeated game guide.