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A Theory of Fun

A Theory of Fun

Why do some games remain fun for years? [Books]

Education·Launched Nov 2015·0 upvotes·smile.amazon.com

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ALIVEverified Jul 10, 2026 · HTTP 200

CohortClass of 2015

What it is

Why do some games remain fun for years? [Books]

HTTP liveness

8 probes since Jun 16

Jun 16Jul 10

AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)

Observed events

probes · press · GitHub

Jun 16, 2026
First probe — live
Alive · 200 OK

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Pulse Indexobserved activity

8 probes0 pressGitHub –Tranco –

Not enough observed signals for a Pulse Index (needs 2+ signal families).

Cohort survival · Class of 2015weekly

12,940 products launched in 2015 · 100% still active

12,899 active41 sunset

Still active

100%

Median lifespan

4.9y