Road, Barrier & Marker

Road

Walkable tiles for builder bots to move on. The cheapest building.

Property	Value
HP	10
Base cost	1 Ti
Scaling	0.5%

Barrier

Cheap, takes up space, and has high HP. Useful for blocking enemy paths or protecting key buildings.

Property	Value
HP	30
Base cost	3 Ti
Scaling	1%

Marker

A tile containing a single unsigned 32-bit integer that can be read by any allied unit. Building a marker is completely free and does not cost action cooldown — you may place at most one marker per round. Markers cannot be placed on wall tiles. Any team may build over markers, destroying them.

Property	Value
HP	1
Cost	Free

Markers are the only form of communication between allied units. Global variables are not shared between Player instances — each unit has its own isolated Python environment.

All units (core, builder bots, and turrets) can place markers — not just builder bots.

# Write a value to a marker
if c.can_place_marker(pos):
    c.place_marker(pos, 42)

# Read a marker
building_id = c.get_tile_building_id(pos)
if building_id is not None:
    if c.get_entity_type(building_id) == EntityType.MARKER:
        value = c.get_marker_value(building_id)

Communication patterns

Since each unit’s Player instance is isolated, markers are essential for coordination:

Scouting reports: Write enemy positions to markers near your core
Build orders: Use marker values as state machine flags
Territory claims: Mark tiles to avoid duplicate work

Overview

Units

Buildings

Combat

Reference

Road

Barrier

Marker

Communication patterns

​Road

​Barrier

​Marker

​Communication patterns

Road

Barrier

Marker

Communication patterns