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This subject appears in Serious Sam: The Second Encounter.  This subject appears in Serious Sam HD: The Second Encounter.  This subject appears in Serious Sam VR: The Second Encounter. 

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Sierra de Chiapas is the first level of Serious Sam: The Second Encounter, Serious Sam HD: The Second Encounter and Serious Sam VR: The Second Encounter, and the fourteenth level of Serious Sam: Xbox and Serious Sam Classics: Revolution.


Following the events of Serious Sam: The First Encounter, after Sam defeats Ugh-Zan III, he goes aboard the Sirian spaceship, the SSS Centerprice and heads off to Sirius. Some Croteam Heads follow Sam's ship, riding on their crate bus. When Sam's spaceship gains speed, the Bigheads decide to use "hypercrate" to catch up with him, but suddenly, the brake to the crate bus stops working. The crate bus crashes on impact into Sam's spaceship, and it crash-lands in Central America, Sierra Madre de Chiapas. Sam must now find the second backup spaceship that was left by the Sirians. To do this, he must find the Time-Lock left to the Mayans by the Sirians. It is located in the grand Mayan city of Teotihuacan, so Sam must fight his way there.


  1. From your starting position, dive into the lake, all the way down, until you see a rather bright spot with an XPML21 Rocket Launcher. Pick up the rocket launcher to register the secret.
  2. Once you surface from the lake, turn right, you'll see some small terrain there, with a tree. Go there, and pick up the armor there to register the secret, although there's a Schofield .45 there as well, but doesn't count as a secret.
  3. From #2, there's a phone booth near the corner of the terrain (behind the rocks, in Serious Sam HD ). Go near it to register the secret, and use it to make a phone call.
  4. (Serious Sam HD only) cut down or blow up 3 trees in the starting area, before the temple, to spawn a Thompson submachine gun.
  5. (Serious Sam HD only) cut down or blow up 3 more trees in the starting area, before the temple, to spawn some bullets.
  6. (Serious Sam HD only) same as #5, to spawn more bullets. On higher difficulties, if you pick up both bullet pickups and the Thompson, two Highlander Aludran Reptiloids will spawn: one right of the temple, far away; and one a bit before the temple to the right, not that far.
  7. From the temple's position, before entering, follow the wall to the left until you see some differently colored wall. Blast it with a rocket to reveal an entrance.
  8. From #7, proceed through the entrance to discover a secret hall of fame, and stick around for a small speech and then disco music.
  9. From #7 and #8, turn left and follow the path to the valley. You'll see some crates. Go near them to register a secret.
  10. From #9, there's some rockets behind the crates. Pick it up, but if you do, some waves of Beheaded Kamikazes (or Kleers, on higher difficulties) will spawn when you're about to leave the valley.
  11. In the corridor followed by the crushing blocks, before going through the blocks, when facing them, turn around, and walk to the dark area, then turn left once you're in a dead end. You'll find Mental's secret room, with a few jump pads with letters on them. If you jump on any pad that doesn't glow, spikes from the ceiling will lower and lower with every jump, until you're impaled and killed by them. Jump on the pad with the letter M first, then on the one with E, then on the one with N, T, A, L. (forms the word MENTAL). A wall opposite of where you entered from will move, revealing an Extra Large Health. You can jump on any jump pad after picking up the health.
  12. When you exit the temple, look towards the pit, on its wall on the side you're on. You'll notice a small ledge sticking out, with a rocket launcher. Drop there and pick up the weapon. Jump on the lower ledge with the teleport to get back.
  13. After crossing the pit, and grabbing the first official rocket launcher, you'll notice a rock on the wall to the left, sticking out. It's rather spherical. Blow it up to reveal a secret path.
  14. From #13, follow the path underwater, and you'll find yourself near a bridge. Pass the bridge and pick up the secret super health.
  15. Before entering the final temple and finishing the level, jump in the lake and dive in until you see a brighter spot with a Large Health. Watch out for the Reeban Electro-Fish that appear upon entering the lake.

Related achievements[]

Serious Sam HD: The Second Encounter[]

Achievement Rocket Man
Rocket Man
Find all 3 rocket launchers in Palenque - Sierra de Chiapas.
Achievement Treasure Diving
Treasure Diving
Find a secret under water.

Serious Sam VR: The Second Encounter[]

Achievement Treasure Diving SSVRTSE
Treasure Diving
Find a secret under water.

Serious Sam Fusion[]

Achievement Treasure Diving SSF
Treasure Diving
Find a secret under water.

Serious Sam Classics: Revolution[]

Achievement Who needs kills, anyway?
Who needs kills, anyway?
Kill less than 8 enemies on the first level of The Second Encounter in at least normal difficulty.
Achievement That all you got?
That's all you got?
Finish the first level of The Second Encounter taking no damage in at least normal difficulty.
Achievement Jumping is overrated
Jumping is overrated
Finish the first level of The Second Encounter without jumping in at least normal difficulty.

Behind the scenes[]

  • The "crate bus" references the introduction where Sam's ship crashes because the vehicle, piloted by Croteam Heads, crashes into it. This was removed in the HD port, but later added back in Serious Sam Fusion. The craft itself is a joke at the expense of Croteam's CEO Roman Ribarić, who thought the English word "crate" meant "vehicle" during an interview with satirical website Old Man Murray in 2000.[1]


  • In the beginning half of the level, until the player enters the temple after the starting valley, is used as a part for the Palenque Demo.
  • This level is split into Sierra de Chiappas and Catacombs in Serious Sam: Xbox. Catacombs has its own music when inside and outside. One of its fight tracks is used for Jump Over, the Serious Sam HD: The Second Encounter versus map. Catacombs also has a complete new area, a huge ramp, with strange gravity, where enemies charge in from behind the ramp and the player has to fight their way through. It also has some elements from the Palenque Demo.
  • Sam's phone call to "Blondie" in Las Vegas asking if he's ready to come out yet is a reference to Duke Nukem Forever.
  • Sam whistles the Peruvian song "El Cóndor Pasa" while crossing the suspension bridge at the beginning of the final section of the level.
  • The Croteam Heads that appear after destroying the wall that leads to the secret hall of fame wear halos in the original version of the game, but not in the HD version.
    • If the player kills the Admir Bighead before he dies to a boxing glove, the crowd will make booing noises and the disco music will not play.
    • However, the player can prevent the Admir Bighead's death by standing right next to him and blocking the boxing glove to his left. The disco music will still play, but the player will take a lot of damage or even die when the boxing glove hits them.
  • The area where Sam says "Hey! Didn't I kick your ass two rooms back?" after killing the second Cucurbito the Pumpkin, along with the first crusher blocks pathway, reappears in Serious Sam: Siberian Mayhem as a secret classic area at the end of The Song Of The Stormbringer. Note that just like in the original, the player can still get gibbed if they get squished by a crusher block, which will prevent any H.E.A.R.T. gadgets from being used if the player had at least one upon death. Although the crusher blocks in Siberian Mayhem now inflict damage of the Killer type, they are scripted to gib the player to simulate Crushing damage always gibbing players upon death in both The Second Encounter and Serious Sam HD.
    • The main differences are that the Cucurbitos are replaced with Octanian Zealots and that a group of C-4 Demolition Charges appear in place of the original items at the end of the crusher blocks pathway.
    • The secret Mental's room also appears, functioning exactly like how it does in the original version of the level.