KOSMOS Die drei ??? UV light code detective kit in metal tin 632397

This UV code detective set from the popular Die drei ??? (The Three Investigators) series is designed for young sleuths who want to write and decode secret messages. The sturdy metal case contains a pen with UV ink, a detachable UV lamp, a stamp bearing the three question marks and an illustrated instruction booklet. Hidden writing only appears under the light of the UV lamp.

The set is recommended for children aged 8 and up and is intended for indoor use. The lamp requires one 1.5 V AAA (LR03) battery, which is not included. Weighing 200 g and measuring 103 × 51 × 143 mm, the case is easy to store and take along.

The guide explains step by step how the secret writing works and encourages children to create their own puzzles. In this way, play turns into a small experiment that introduces young users to the effects of UV light.