Add a new tool, before “Fire”:-

• Burnt stick. If a Burny Stick or a Burny Pointy Stick has been carried by a Caveman for more than one hour, any Caveman may turn it into a Burnt Stick.

To the effect of the “Sky Fire” Research Project, add:-

A Caveman who has Knowledge of Sky Fire, and who is carrying a Stick (of any type other than “Burnt”) may, as a daily action, remove that Stick from their Tools to add a Burny Stick to their Tools.

To the effect of the “cave painting” Research Project, add:-

If a Caveman knows Cave Painting and is carrying either a Burnt Stick or a Red Rock (known as the “Painting Tool”), then he or she may, as a weekly action, reduce the cost of any Open Research Project by his or her own Intelligence, provided that they have Knowledge of every Prequisite of the Project. Upon doing so, the Painting Tool is used up and is removed from their Tools.