About SOS: Pen and Paper

SOS turns two letters into a contest over open squares. Place either S or O: every new straight SOS word scores a point and lets you move again. This edition uses the scoring variant on 5×5 and 7×7 boards. Choose three computer levels or share one device with another player. The daily challenge supplies a five-letter opening on 5×5 against Hard. Hints suggest a move rather than making it; unfinished matches and statistics stay in this browser. This edition has no cloud-save adapter.

How to play

Open the menu, choose a computer or local opponent, select a board size and Start. Pick S or O and an empty square. Completing a word earns another turn; a scoreless placement passes play to the opponent. Fill the board and compare the final scores.

Rules in this version

Either player may place either letter; nobody owns S or O.
Only consecutive S–O–S squares in a row, column or diagonal score. A placement can finish more than one word.
Each new word earns one point and an extra turn. A scoreless move switches players.
A full board ends the match. Higher score wins; equal scores draw.

Tips for playing

Scan all four directions before placing a letter; the best square may finish two words.
A lone O beside an S can become a gift to your opponent. Check the remaining third square.