Peak Order

Features arrive one at a time, mountains by height, rivers by length, lakes by depth. Drop each into the gap where it belongs in the running order. A wrong placement costs you, so judge the magnitude before you commit.

• Read the current feature and the measure being ranked
• Click the gap where it fits in the order
• Build the list from biggest to smallest (or as the round asks)
• Place every feature correctly to clear the round

• Desktop: click the gap in the ranking where the feature belongs
• Phone & tablet: tap the gap to drop the feature there

• Daily: one shared seeded ranking ranked globally
• Practice: fresh feature sets each round across difficulty levels

• Anchor on a few landmarks you know, the tallest peak or longest river, and place others relative to them
• When unsure, bracket the feature between two you've already placed correctly
• Don't guess wildly; one misplacement can ripple through the rest of the order

Peak Order is about ranking the world's mountains, rivers and lakes by their measurements, building a sense of scale.

• Skills: physical geography, comparing measurements, world features, estimation
• Best for: roughly grades 4–9 (ages 9–15)
• For parents & teachers: puts the planet's superlatives in proportion.

Slotting mountains by height, rivers by length and lakes by depth into a running order is ranking under uncertainty rather than recall of a list.

Arriving one at a time, with a cost for a wrong slot, is the original structure.

Insertion is harder than sorting a full list, because each placement is made without seeing what is still to come. It also exposes how compressed the top of these rankings is — the difference between the second and tenth highest peaks is far smaller than most people assume.

Peak Order is an original, free browser game about ranking the world's mountains, rivers and lakes by their measurements. Play instantly with nothing to install.

A free, original browser game on PlayPendium. No download, no install.