Spy Labs Invisible Ink Pen and UV Light p576 There's also a transformation chamber

There's also a transformation chamber feature to recreate Kathi's emotional 'before and 'after' reveals

This stacking toy teaches all these lessons and is even more fun when it builds a happy-looking frog

encouraging open-ended

Includes more racks and numbers to accommodate the extra players

Spy Labs Invisible Ink Pen and UV Light p576 There's also a transformation chamberWhether you're raising a young Sherlock Holmes or a future James Bond, your little investigator needs the high tech help of an invisible pen and UV light to reveal evidence and complete secret missions. This pocket sized pen is perfect for stealthy invisible message writing on the go. And the UV light illuminates other items that glow! Requires 1 AAA battery, not included. From Thames & Kosmos, for ages 8+ yrs.