Greendale is the 23rd level in Serious Sam 2.
He appears near the top of a castle built inside a rock wall that is overlooking a village. Sam fights his way to the ground and finds a drawbridge that'd let him go to the village across the river. However, the door to the drawbridge is locked, so Sam travels to a nearby miller and obtains a key from him while under fire from enemies.
Sam unlocks the gate to the drawbridge, but a strange accident involving a Gnaar getting his arm ripped off and stuck in the drawbridge's mechanism prevents him from continuing until he removes the Gnaar's arm from the mechanism. With that done, Sam lowers the bridge and travels to the village.
However, the village is under attack by a very large amount of Mental's forces. Sam, as usual, takes them all out and saves the village in the process.
1. After going down an elevator and exiting the castle, go left. When you get start getting close to the buildings on the left side that are facing the water, several enemies, such as Rhino Cybertoys and Cannon Turrets, will spawn. Kill them, then continue advancing until you are facing the rock wall at the end of the left path. When you're there, turn right and keep going until you see a Treasure Chest. Pick it up to register the secret. After picking up the Treasure Chest, two T-Mechs and Cannon Turrets will spawn in.
2. As soon as you reach the village on the other side, go right and walk along the edge of the river (you won't fall off thanks to an invisible wall). Continue following it until you see a Backpack. Pick it up to register a secret.
3. From Secret 2, continue going right. You'll know when you're on the right path if a legion of Spiders spawn in front of you and Football Players appear behind you. Kill them, then keep going until you see a small tower in the distance. Get close to it, and a secret will register, along with a Treasure Chest and CH-181 Hover Bike teleporting in. If you pick up any of the items, three T-Mechs will spawn close to the drawbridge exit. The Hover Bike is going to be very useful in the following battle in the village, where you are going to face Big Spiders and T-Mechs.
4. When approaching the village, look for a set of huts on the right side of the arena. When you've found them, turn so that you're facing them. Go to the right of the right-most hut (if you need a hint, there's a fence to the hut's right as well) and you'll find a Super Health. Pick it up to register the secret.
-On the bridge, Sam is istantly facing lots of Football Players, deal with them using Rocket Launcher at first, but you will go out of rockets in no time; this is where Grenades shines: use them along with the Double Shotgun, the former to "soften" them from distance, the latter to inflict the final blow. After they are defeated, Albino Cyclops will spawn and finally a Seagull Fighter is coming; if you want to destroy the bomber (ex. for score purposes), quickly grab the Sniper Rifle on the other side of the bridge, one neat scoped shot will do the job. Dont worry for ammo waste during the fight, as an Ammo Pack and some sniper bullets are near the Sniper Rifle.
-After crossing the bridge, there are lots of ammo pack scattered on the way, so the player can use pretty much all the weapons, including grenades and rocket launcher, without worrying about running out of ammunitions.-When reaching the village, if you kill al the enemies that spawn there (T-Mech, Centaur, Spider etc.), the game will go instantly to the next level, in a pretty annoying way, because the player wont be able to search for extra health, ammo and coins. To prevent this, keep alive just a couple of weak enemies, search for stuff in the village, then follow the path to a little fortification, where two Big Spiders and Cannon Turrets will spawn; if you go in the entrance, you'll go in the next level, even if some enemies are still alive.