The World is Mathematical

This release brings the long-promised decimals and fractions to the Math

Corner, and extends Pythagor Hall to circles.

— Math Corner — Decimals & Fractions —

A full new wave of lessons and exams arrives in the Math Corner:

8 new lessons covering decimal addition, subtraction, multiplication,

division, and the introduction to fractions ("when a number breaks"),

followed by simplifying fractions. 20 new Den exams give plenty of

practice for each new notion.

— Pythagor Hall — Circles —

The PythaCercles lesson now extends to the disk's area — distinguishing

the circle (the boundary) from the disk (the interior), with concrete

calculations using π ≈ 3.14.

Two new Den exams on circles:

• The system draws a circle; you measure its radius and diameter with

your ruler, then compute the circumference and area.

• You draw the circle yourself with a given radius, erase your

construction marks, then answer the same four measurements.

— Geometry — Quality of Life —

Tool controls now show on-screen. The set square can be flipped (F).

You can zoom in closer for precise constructions. And you can grab

and use the geometry tools while ProfFil is still talking — the

scenario catches up with your anticipated actions.

ProfFil's hint in Den geometry exams now also covers circles: it

tells you whether the circle is missing, drawn around the wrong

center, with the wrong radius, or simply not asked for.

— More —

Press Space to fully pause the game during lessons. The Knowledge

Tree got a major readability pass (short names + tooltip + visible

prerequisites). Den exams now play a clear success/failure sound.

Plus various fixes across the geometry stack — including the answers

page no longer leaking your construction markers into the PDF copy.

Full devlog available in-game, under the Version History panel.

Update is live — load up your save and dive in.