Portcullis: Four in a Row

Four in a row offline against the computer. Tap a column and your brass disc drops to the lowest free cell. Line up four of your discs across, up or diagonally to win, and block the black discs before they make four of their own. A full gate is a draw, and a draw does not clear the level.

The gate grows as you climb: 6 by 5 for the first ten levels, then the classic 7 by 6, then 8 by 7 and 9 by 7. From level 25, iron rivets sit at the foot of some columns. A rivet belongs to nobody. It raises that column's floor and breaks every line through it, so the openings you know from the plain board stop working.

The computer rival starts gentle and gets stronger as you climb, looking a few more drops ahead every few levels. By the top of the ladder it is very hard to beat. Its strength shows above the gate.

Every fifth level is a puzzle: a set position and a goal such as "win in 3 drops". Force four in a row within that many drops while black defends as hard as it can. Each puzzle was checked by search to have exactly one winning first drop.

Three boosters help. A hint marks the best column. Undo takes back your drop and the reply to it. Peek shades every column that would hand black a four on the spot. Win without help for three stars.

Two Players mode puts two people on one phone, brass against black. Pass the phone after each drop, and a rematch swaps who drops first.

Press and slide along the top of the gate to aim, then let go to drop. No timer. A level map tracks your stars. Works offline, no wifi needed to play.

Recent changes:
First release.