Immune command

How to play Immune command

Immune command is a tower defense game set inside the human body. Each level is an organ with one or more blood vessels running through it, and viruses ride those vessels from an entrance to an exit. Your job is to stop them before they leak out, because every leak costs organ integrity and the level is lost when that hits zero. Pick a cell type from the tray (or press 1 to 7), then click or tap a tissue tile next to a vessel to place it. The ring shows how far its cells or antibodies reach. Viruses drop energy automatically when they die, so there is nothing to collect: spend it between waves on new cells, on a tier 2 upgrade, or on one of two exclusive tier 3 specialisations that change how a cell behaves. Click a placed cell to see its numbers, change what it targets (first, strongest or fastest) or sell it for most of its cost. Press Start wave when you are ready. After a cleared wave you get thirty seconds to build before the next one starts by itself, and starting sooner earns a small bonus. Once a wave runs, the control bar under the board pauses it or plays it at normal, double or triple speed. Every leak also stresses the tissue near the exit, and two hits tear a lesion that nothing can be built on. Breacher viruses stop halfway and pulse for over a second before tearing a tile on purpose. A Platelet station shields the tissue around it, closes one lesion in reach for free after every wave and knits some organ integrity back. Stars count only what gets through: three for a level with no leaks, two when integrity stays above 60 percent, one for clearing it. The campaign has eight organs from a capillary bed to a full-body crisis, with a new cell or virus introduced in almost every level, and each one can be played on Training, Response or Critical. Your progress, best scores and star ranks are saved on your device, and a run is checkpointed at the start of every wave so you can retry from where it went wrong.

Tips

• Place cells on the inside of bends and where two vessels come close, one cell then covers more of the route
• Antibodies from the B-cell lab pierce armor, macrophages stop splitters from splitting, and natural killer bursts block regeneration
• An Interferon relay does no damage on its own but slows every virus in its ring and speeds up the cells around it
• Watch the wave preview before you start: it lists every virus type and which vessel it enters through
• Kill breachers during their pulse or keep a Platelet shield over the tile they aim for, a lesion costs you a build spot for the rest of the level
• The next wave starts on its own thirty seconds after the last one clears, and starting it sooner earns a small energy bonus that adds up over a level
• Stars only count leaks: keep every virus inside the vessel for three stars, torn tissue does not cost you a star
• Bosses show their next phase on their health bar, sell and rebuild if the phase asks for a different counter

About Immune command

Immune command borrows its cast from real immunology and then bends it toward a good tower defense. Neutrophils really are the first responders that swarm an infection, macrophages really do engulf whatever they catch, B-cells make antibodies that stick to specific invaders, killer T-cells hunt infected targets, interferon is a signal that puts nearby cells on alert, natural killer cells finish off weakened targets and platelets clot and patch damaged tissue. The viruses are invented, but their tricks map onto things a real immune system has to deal with: armor that shrugs off weak hits, swarms of tiny particles, mutation that dodges one kind of defence, and pathogens that damage the tissue itself. None of it is a biology lesson, the numbers are tuned for play, but the names give each choice a reason. The game is built for the browser with a Canvas 2D renderer and a fixed 60 Hz simulation, so it runs the same on a phone and a desktop and a wave plays out identically whenever you retry it from a checkpoint. The board is a slab of tissue seen from a tilted, three-quarter camera: the vessel is a channel cut into it, and the cells and viruses are little cartoon characters that stand upright on the tiles, cast shadows, blink and look at whatever they are fighting. Everything on screen is drawn from shapes and colours rather than downloaded art, the sounds are synthesised on the fly, and there are settings for reduced effects and a high contrast board. Eight organs, seven cell types with two specialisations each, ten virus types and four bosses make up the campaign, and the data is laid out so more of each can be added later.

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