Serious Sam HD: The Second Encounter is a fast, loud campaign for groups who want a straightforward job: cross three strange worlds and keep Mental’s army from filling the screen. The online co-op campaign supports up to 16 players. For local split-screen, launch the game through the free Serious Sam Fusion 2017 hub, which adds that feature to the HD game. Fusion also supports multiplayer across Windows, SteamOS, macOS, and Linux, provided everyone launches the same game. Expect broad arenas, sudden monster waves, and a lot of movement between bursts of fire.
Three worlds, one clear purpose
The campaign picks up Sam Stone’s battle against the alien forces of Mental, moving through South America, ancient Mesopotamia, and medieval Europe. Those settings give the action a welcome change of scenery: leafy ruins and overgrown paths give way to ancient stonework, then snowy villages, castles, and courtyards. The premise stays deliberately simple. Sam is here to shoot his way through an army, and your group spends most of its time doing exactly that.
That directness shapes the pacing. You cross large outdoor spaces and winding temples, look for a switch or key that opens the route forward, and enter arenas where enemies pour in from several directions. A quiet stretch can make the next wave feel louder; then the last monster falls, you collect supplies, and move on. It is a campaign built around clear changes of pressure rather than dialogue scenes, equipment menus, or a chain of elaborate objectives. The basic loop is easy to follow when friends have different levels of shooter experience: the route gives everyone the same broad goal, and a new room makes the immediate problem obvious. The arenas can still become demanding as several enemy types overlap, but there is no character build to learn before joining the group.
The maps also hide more than 130 secrets, including some added for this edition. They can contain useful supplies or simply reward checking a suspicious ledge or side passage. The hunt for them gives the levels room to breathe between battles, though finding one may also send you into another fight. Secrets are optional; the main route already has plenty of enemies to keep a full group busy.
Weapons for different kinds of trouble
The game lists 27 enemy types, including returning Headless Kamikazes, Sirian Werebulls, and Kleer Skeletons, plus five new enemies and three bosses. You will see fast attackers rushing straight at you, airborne threats, and heavier targets that take more punishment. Their patterns are readable, but the pressure comes from combinations: a close threat can occupy your attention while another enemy fires from farther away.
Sam starts with familiar pistols and shotguns, then builds toward a broad set of weapons such as the rocket launcher, minigun, and portable cannon. This edition adds a sniper rifle, flamethrower, and chainsaw. The sniper rifle reaches distant targets across open spaces; the flamethrower sweeps a close group; the chainsaw is a risky answer when a monster has closed the gap. Those tools make distance matter. A shot that solves a far-off threat may be awkward once a crowd is within arm’s reach, so the action keeps pulling you between aiming, moving, and changing weapons.
That does not create fixed character roles. You and your friends use the same arsenal and face the same arena together, with different players naturally covering what is closest to them. There are no class trees to coordinate or gear builds to compare before a level. The shared task is keeping the monsters from surrounding you while the group works through the wave. Power-ups briefly boost combat and agility, adding a different pace to the fight when someone finds one. Some threats announce themselves with distinctive sounds, so the mix of cries, explosions, and weapon fire becomes part of the arena’s information: a warning can tell your group that a charging enemy is close even when the screen is full of other targets. That audio layer helps give waves their own texture.
The tone matches the scale: oversized weapons, strange creatures, dramatic music, and Sam’s one-liners keep the violence playful. The monster roster mixes headless bomb carriers, charging bulls, skeletal beasts, and pumpkin-headed attackers. There is little attempt to make those enemies belong together in a realistic ecosystem; the point is to make each new combination visually distinct as the next wave arrives. For friends who want a serious military simulation or a story-led campaign, that looseness may feel thin. For a group that wants to recognize a threat quickly and shoot it before it reaches the center of the arena, it keeps the focus clear.
Co-op changes the campaign’s shape
Classic co-op lets your group carry the campaign forward together. Online sessions support up to 16 players, making the largest encounters feel even more crowded and leaving room for a big call. Dedicated-server support is available, so a hosted session can run separately from a participating player’s own match. Online modes include campaign co-op, competitive play, and team variants; there is no class-based party or required healer or builder role.
Two co-op variations alter the campaign rules. Coin-Op limits a campaign run to three lives, making each death more consequential than the ordinary return to action. The limit adds stakes to familiar arenas without changing their weapons or enemy roster. Survival focuses on staying alive against continued enemy attacks; its specially designed maps turn the waves into a score or endurance challenge rather than a trek through the full campaign. Survival also appears as a campaign co-op variant, so the name covers both that variation and purpose-built Survival maps.
For local play, launch the game through Serious Sam Fusion 2017. Fusion is a free hub that links supported games you own and adds split-screen to the HD version; the standalone HD launcher itself does not include split-screen. Fusion supports local split-screen and controller play, but Fusion remains in beta and occasional bugs are possible. You will need one computer and display, plus a way for each person to control a character. Each player gets a pane on the shared display, so screen space is part of the local setup.
More ways to turn the levels into a match
The multiplayer menu also has versus and team modes across more than 18 maps. Capture the Flag and team deathmatch offer familiar objectives, while modes such as Beast Hunt layer a contest between players or teams over the campaign’s monster-filled levels. Other variants change the win condition: Last Man Standing removes respawns, Instant Kill makes each sniper shot decisive, and My Burden awards points to the player carrying a marked object. These modes are competitive, not extra campaign co-op, but they give a group another use for the same weapons and arenas.
With a level editor, Steam Workshop, and leaderboards, there is also room to revisit or alter the experience after the main route. Those extras suit groups that enjoy replaying arenas or trying community content. Cooperative leaderboards let your group compare team scores across repeat runs. A second pass can focus on missed secrets or different co-op rules instead of unlocking a new character build. Workshop maps can extend that loop, though they are community additions and their quality and availability vary. None of these extras is necessary to understand the game; the core campaign does not depend on progression systems outside collecting weapons, power-ups, and secrets as you go.
Who should bring this one to game night?
Bring it up when your group wants a direct shooter with huge waves, quick movement, and a little room to explore between fights. The premise is easy to grasp even if someone has not followed the series: cross the map, find the route forward, and deal with whatever charges out. Online play scales as high as 16, while Fusion adds local split-screen for a group sharing one computer.
The same repetition is part of the bargain. Much of the campaign asks you to fight more combinations of familiar enemy behaviors, and the long battles can begin to feel similar. Co-op keeps the action moving through deaths, so one missed dodge need not end the whole run; Coin-Op is the mode for groups that want lives to matter more. If your group would rather sneak, solve intricate objectives, or build specialized characters, this is not that kind of shooter. The AI does not offer elaborate squad tactics; enemies rely on recognizable attacks and numbers. The jump and gravity-bending sections also interrupt the firefights; if your group prefers to stay in the shooting rhythm, these stretches may feel frustrating. When the campaign is working for your group, its appeal is in the contrast between a briefly open path and the next wall of creatures, with enough weapons and co-op variations to keep that rhythm moving.