← DecipherWorld Lemonade EmpireFor teachers

Twenty Years

Class 6 · Tapestry of the Past · Ch 4 & 6

Thirty people. One valley. Where do you put them?

Wherever you settle, you stay for twenty years. There is no hint here about which ground is best — that is the whole point.

DecipherWorld · GyanLearn Edusolutions Prototype — one concept of ten

What this game teaches

Twenty Years is a free history game for Class 6, 7 and 8. Your child settles thirty people in an empty valley and lives with that choice for twenty years. Nobody is told which ground is best. They find out.

The concept underneath is the one every Social Science exam asks about and almost every child memorises without understanding: why did early cities grow near rivers? The answer is not “for water”. It is a chain, and in this game a child walks the whole chain themselves:

  1. The river floods and destroys the fields
  2. The water recedes and leaves fresh silt behind
  3. That soil grows more food than the people can eat
  4. So some people stop farming and become potters, weavers and traders
  5. The extra grain has to be stored
  6. Whoever holds the key to the store gains power
  7. Marks are pressed into clay to remember whose grain is whose — writing
  8. Arguments over shares produce rules

Settle on the safe hill instead and twenty years later you are still thirty people, still farming, with nothing made and nothing written. That is the lesson, delivered as a result rather than a sentence.

Which chapter it covers

NCERT Class 6 Social Science — Exploring Society: India and Beyond, Theme B, Tapestry of the Past. It supports Chapter 4, Timeline and Sources of History and Chapter 6, The Beginnings of Indian Civilisation, and it sets up the Harappan material in Classes 7 and 8.

Questions people ask

Why did early civilisations settle near rivers?
Floods left fresh silt, so the land grew more food than the people needed. The surplus freed some of them from farming — and a settlement with people who do not farm is a town, not a village.
Were all early cities built on rivers?
No. Cities form wherever a surplus concentrates. In the game the coast also grows into a town, because salt and fish are a surplus of a different kind. A river is the commonest route to surplus, not the only one.
Is it free? Does my child need an account?
Free, no login, nothing to install. It runs in any browser on a laptop, tablet or phone, and we ask for no personal details.
How long does it take?
About twenty minutes to play the twenty years, and another ten for the writing at the end — where your child answers the exam question in their own words, using what happened to them.

More from DecipherWorld

Lemonade Empire — the Class 6–8 maths game where children run a business and meet unit cost, ratio, percentage, margin and break-even. Learn — short explanations of the concepts behind the games. For teachers · For parents · For schools