Guess Who is a deduction game played across a board of faces. Each player secretly picks a character, and you take turns asking yes-or-no questions — does yours wear glasses, is yours blonde — eliminating faces until only one remains.
The skill is in the questions. A question that splits the remaining field roughly in half is worth far more than one that eliminates two faces, which is the same logic that underlies binary search.
Ask questions that eliminate about half the remaining faces each time. Halving the field every turn identifies a character from 24 in about five questions; asking narrow questions takes far longer.
Yes — there's a multiplayer mode alongside playing the computer.
Yes — tap to ask and eliminate. Nothing to install.