Serious Sam: The First Encounter HD is the re-release of The First Encounter; it was first released in 2001 and the HD re-release entered the market in 2009. They were developed by Croteam and published by Devolver Digital.
Being a remake this game has the same plot as the original game. It's set after Serious Sam 3: BFE where Sam has been sent back in time to defeat the evil being known as Mental and to help the Sirians in their fight against it.
The game is split into 15 linear levels which are filled with secrets for the player to find; these secrets usually impact the gameplay and provide the player with new weapons, special powerups are hidden areas filled with enemies. Some of the levels in the game have objectives which the player can complete to gain special bonuses or rewards.
Each level is split into arenas and exploration areas in-between the arena zones; the large arenas are filled with enemies which need to be defeated before the player can leave the area. While the levels are made up of mostly arenas there are also small zones with fewer enemies which allow the player to explore for ammo or other useful items.
There are a wide variety of enemies in the game which each have different types of attacks; each of the enemies in the game reward the player with points once they are killed. Weapons can be collected from around the map and each one is specifically designed to deal with a certain situation or type of enemy. While the player obtains new weapons throughout the game, none of them ever become useless due to each one having a purpose.
Players can play the offline campaign with up to four players in one instance with the split-screen feature; in addition to this, the online co-op mode allows for up to 16 players in one campaign instance. When playing the online co-op it is possible to change various game factors such as respawns and enemy health before starting the game.
It also features a classic competitive PvP mode; players can engage in Deathmatch arena battles where the player with the most kills wins the game. This mode can be played online or offline with the split-screen function.
 What's New
Serious Sam: The First Encounter HD is almost exactly the same as the original game; the main difference is the fact this game has seen a large graphics overhaul. The levels are exactly the same however various game models and textures have been updated.
This version of the game does not include the Scorematch PvP gamemode; this mode is only available through the original game.
15 levels – Blast through the hordes of enemies and hunt down the various secrets within them
Arena battles – Fight through waves of enemies in the various arenas
Unique weapons – Every weapon in the game has a specfic purpose that makes them more useful in certain situations
Offline co-op – Play with up to four play players using split-screen
Online co-op – Take the fight online in a group of up to 16 players where the campaign can be customized to suit the group
PvP – Battle online and offline with the classic Deathmatch gamemode
 Players liked:
- High replay value
- Great co-op and multiplayer
- Fast paced action
- Amusing gameplay
 Players didn't like:
- Too short
- No new gameplay features
- Limited PvP
Serious Sam: The First Encounter HD is available for the Xbox, Xbox 360 and Windows PC.
 Minimum Windows requirements
- OS: Windows XP
- Processor: Intel Pentium 4 3+ Ghz or AMD Athlon64 3500+
- Memory: 1 GB
- Graphics: nVidia GeForce 7600, ATI Radeon X1600