Yes, you can play old school MUDs without the M. Download a tiny server simulator. It feels like playing Game of Thrones on a calculator.

: A lightweight app that bundles logic puzzles, number challenges, and classic board games. It is optimized for low-storage devices and works perfectly in airplane mode.

PuzzlePrime offline pack

Sudoku, Chess, Solitaire, Mahjong. The Source: Lichess.org (Offline mode) & Green Felt Solitaire.