Where to find the Green, Blue, Yellow, and Red gems in Crash 4 and unlock the secret door
This gem can be found in the N. Sanity Peak level. When you reach the second door, look out for a diagram carved in stone. It shows how to solve the platform puzzle ahead, where you have to jump between a 3x3 grid of stones in a specific order to nab the gem.
You'll find the green gem in the Hit the Road level, near the end of the stage when you're being chased by the truck. When you reach the checkpoint with the trash cans, spin them to make a remote appear. Spin this and a toy truck will spawn. Spin the truck to unlock the gem.
Found in the Draggin' On level. This is the hardest coloured gem to earn in Crash 4. Why? Because you have to reach the end of the stage without breaking a single crate. Good luck!
Found in the Run it Bayou stage. Before you hop on the jet ski, jump to the platform on the right, then bounce across the boxes to the next one. Once you reach the platform with the four crates, jump off the top of them to grab the gem from behind the sign.
Once you unlock all four gems, head to the Toxic Tunnels level. Play through the stage until you reach a huge door, which will promptly open if you have the gems. You'll need serious skill to make it through the resulting bonus area.
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