NumArk

NumArk is a lightweight offline trainer for number sense and focus. It turns arithmetic, logic, memory, attention, and estimation practice into short playable sessions you can start anytime. Current practice modes include: - 24 Points: use four numbers and arithmetic operators to make 24. - Sudoku: solve generated 9x9 logic puzzles with notes, hints, undo, and redo. - Quick Math: answer timed arithmetic questions and build score through streaks and speed. - Number Memory: memorize a flashed digit sequence and type it back in order. - Schulte Grid: find shuffled numbers in sequence to train visual attention. - Delayed Math: answer the previous equation while remembering the current one. - Number Estimation: choose the closest result without exact calculation. - Number Compare: decide which multiplication expression is larger, or whether both are equal. Each practice mode supports Easy, Medium, and Hard difficulty. The app stores best results, recent sessions, and achievements locally on your device so you can track progress without an account. NumArk works offline, does not require sign-in, and avoids leaderboards or social pressure. Use it as a compact number-sense trainer or as a quick focus challenge between tasks.