Mega Construx Breakout Beasts Slime. 3 Different Beasts to Build. Green Set #1250936. Includes Blackheart, ironclaw and Boulder. Ages 5 years+ Buildable beast packaged in a mystery, slime-filled egg. Open the egg to unleash a slime surprise and reveal the pieces to build your beast! Each beast has its own unique look and comes with orange, blue or green slime