Infectious Smile Build and Survive: Base Building and Defense Guide

Infectious Smile build and survive mode challenges players to construct defensive forts during a five-minute preparation phase before holding out against bomb-wielding infected smilers during the night round. Human survivors earn eighty coins upon lasting the full duration.

Match Phases and Round Economy

A match divides into two distinct stages: afternoon preparation and night defense. When loading into a new map, human players receive five minutes of daylight to build shelters. During this daytime segment, jump height increases to seven blocks, and fall damage remains disabled. Players who stand near the central white smiler spawn pad increase their probability of becoming the initial host smiler up to 40 percent, while remaining far away keeps the baseline selection chance near 11 percent.

Once night falls, the round lasts for five minutes. Jump height drops back to two blocks, and smilers spawn equipped with destructive bombs. Smilers win by infecting all humans before time expires, granting seventy coins to the host smiler. Human survivors receive eighty coins for lasting the full round. Every player receives five bonus coins per smiler killed or human infected. A smiler who grabs a human and executes a bomb self-destruct secures fifteen bonus coins.

If an entire human team is wiped out, the expedition counter resets to Day 1. Surviving consecutive days causes the server to progress through increasingly complex terrain types, including mountain ranges, sheer cliffs, and fragile ice sheets that dissolve when night begins.

Default Materials and Block Durability

Every player receives 55 Wood, 25 Concrete, and 7 Steel blocks upon joining a server. Additional blocks cost coins in the mode shop. Purchased blocks remain in the inventory until leaving the server, while unlocked categories remain available permanently. Players who purchased the VIP pass begin matches with the TNT block pre-unlocked.

Explosives deal flat area damage to structures, stripping 50 durability from every block caught inside the blast radius.

Building Archetypes and Structural Decisions

Constructing a reliable fortress requires balancing height, pillar density, and smiler pathing. Stacking blocks straight upward without horizontal support creates easy targets for explosive demolition. Veteran smilers use shift-lock camera adjustments to wall-hop up smooth vertical surfaces. Humans prevent wall-hopping by placing horizontal blocks around the perimeter of the eighth block on any pillar.

Entering the command :peak into the chat window instantly teleports a builder to the highest block directly above their avatar, allowing fast returns to upper platforms before the daylight timer runs out. Blocks do not connect diagonally, meaning diagonal placements collapse independently if their primary support breaks.

A solo survivor building six to eight pillars at a height of seven blocks can construct a durable bridge using only starting supplies. Connecting neighboring towers at equal heights creates secondary evacuation routes, preventing a single pillar collapse from wiping out all defenders.

Anti-Smiler Traps and Defense Machines

Automated and mechanical defense systems eliminate smilers without exposing humans to direct grab attacks. Combining mechanical blocks with logical triggers allows defenders to cover blind spots.

Defenders create lethal spinner traps by placing a wooden wheel on a stable support, mounting rockets facing one rotational direction, and attaching laser shields or grate traps to the rotating arms. Connecting a lever or battery activates the spin, creating a lethal barrier that eliminates smilers on contact while allowing humans to pass through intact laser fields.

Pairing a smile sensor with a smile magnet creates an automated target tracking device. The smile sensor detects enemies within a thirty-block radius, outputting power through adjacent connections. Mounting shotgun turrets on a wheel equipped with a smile magnet causes the assembly to track the nearest smiler automatically, firing high-spread bursts that yield two coins per kill.

Defenders streamline vertical mobility by building a fan-powered elevator. Placing a fan block facing upward at the bottom of an enclosed vertical shaft propels humans directly to the rooftop without providing smilers an easy staircase. To keep smilers from using the updraft, players position a laser pad across the exit or seal the shaft during emergency breaches.

Defenders also secure their forts by deploying build and survive traps around low entry points.

Smiler Bombs and C4 Disarmament Tactics

Smilers spawn with distinct bomb variants that dictate defensive priorities. Standard bombs require multiple detonations to crack concrete, while flame bombs ignite exposed wood blocks and spread across entire timber floors. Extinguisher providers neutralise fires before flames destroy foundational pillars. Mega bombs slow the carrying smiler to a walk but level wooden pillars in a single detonation.

Surviving late rounds requires understanding advanced rules for how to survive as a human. After Day 7, smilers frequently spawn with C4 explosives. Planting C4 initiates a 60-second countdown accompanied by an audio siren. If the timer reaches zero, the detonation vaporises roughly 70 percent of all map blocks and applies severe ragdoll knockback to every player.

Humans disarm C4 by approaching the charge and holding interaction for three uninterrupted seconds. Successfully disarming the device awards 25 experience points, protective potions, and a tommy gun capable of eliminating smilers in a single shot. One random human receives the Expedition Flag during the infection phase; placing the flag or carrying it in the inventory grants surrounding teammates complete ragdoll immunity against concussive blasts.