Column 21

You get one card at a time and four columns to put it in. A column clears three ways: its total lands on exactly 21, a wild card drops into it, or it survives to five cards. Push a column past 21 and it busts, which empties it, breaks your streak, and spends one of three strikes. The third bust ends the round early.

Clears pay 200, 400, or 600 depending on how they happen, and those values stack, so a five-card column landing on exactly 21 collects far more than either on its own. Consecutive clears add a streak bonus that climbs to 1,250. Whatever is left of the 180-second clock converts to points, and playing the deck all the way out without a single bust pays a bonus on top.

The format rewards specific habits: which column absorbs a high card when all four are at risk, when to take a clear immediately versus holding out to build a streak, and how to avoid the bust spiral that burns three strikes in under a minute. Disciplined placement beats random placement by a measurable margin across enough rounds.

Column 21 runs the same scoring engine we used to build the strategy guide. Practice on seeded, repeatable deals and review the positions afterward. A repeatable seed lets you change one decision on the same deck instead of mistaking a lucky shuffle for better play.