The last little tyke that leads to the last easter egg for the Sonic Zombies installment for "LEFT 4 DEAD",in which will assist the players to understand the storyline more better....
The Ruby Teddy Bear

This creepy-yet-harmelss teddy bear will wonder around after 10 or 15 rounds in the zombie carnage,and once it appears at some point,you must follow it and it will lead you to the construction site,outside the museum,and you must elevate to the top level of the unfinished building - and there,the teddy bear will be waiting for you - and once you reach to him,you must pick him up and he will transport you to a Cathedral,and oddly enough - empty? At the left side of the grand organ,is a basket of confession,and there seems to be a lonely piece of paper....with Eggman's hand writing? This may lead a hint of the next chapter of the Sonic Zombies "The Condemned",,,

After the easter egg quest,the little bear will reward you an "Instand kill" perk,why? Because usally,the more rounds you advance,the longer the carnage lasts - so I figured,you may use the instand kill to gain more points,and waste less ammo.....at least for 2 rounds ^^; (Don't worry,he'll be back soon :D)

Enjoy :D