528 Mode

528 Mode is a config-enabled alternate game mode that significantly increases the difficulty of mechanics and recipes. It can be considered the direct antithesis to baby mode. This gamemode is a constituent of 328 mode, which is a combination of 528 mode, expensive mode, and rampant mode.

Changes

Mechanics

528 mode significantly alters a few mechanics in order to make the game more difficult. In true 528 Mode (default with no config changes):

RTGs are forced to decay.
RTG pellet power is forced to scale down as it decays.
Long-lived nuclear waste decays in 15 hours instead of 3 hours.
Short-lived nuclear waste decays in 3 hours instead of 15 minutes.
Tungsten reachers don't work for pyrophoric items.
Tungsten reachers reduce radiation dose rates to ${\frac {\mathrm {rad} }{49}}$ as opposed to ${\sqrt {\mathrm {rad} +{\frac {1}{\left(\mathrm {rad} +2\right)^{2}}}}}-{\frac {1}{\mathrm {rad} +2}}$ . This actually makes it better than in normal NTM until about 2400.96 RAD/s.
Chicago pile uranium rods transmute to plutonium at 75,000 flux instead of 50,000 flux.
Chicago pile lithium cells transmute to tritium at 50,000 flux instead of 30,000 flux.
Chicago pile bred uranium rods emit 13.124 RAD/s instead of 5.8 RAD/s.
Chicago pile plutonium rods emit 13.75 RAD/s instead of 6.425 RAD/s.
Gas shales contain 50 mB of petroleum gas instead of 250 mB.
The RBMK dial dialReasimBoilers is forced to be true. This makes non-ReaSim components impossible to use.
"Bosnia Simulator" is enabled, meaning anti tank mines spawn across the world.
Machine gravity is enabled, meaning that most large machines will tilt if not given a proper foundation (this generally means full blocks that aren't sand). This happens in normal NTM with the big-ass tank.
Players burn in the nether.
All blocks from the Applied Energistics 2 mod explode upon being interacted with.

Recipes

Precision Assembler

Various machines and items now require a blueprint and a precision assembly machine in order to manufacture (though machines that required the plasma forge still use it). These items, which are grouped by their blueprint, are:

Blueprints
RBMK Structural Column, RBMK Autoloader
Microchip
Gas Centrifuge
Versatile Integrated Circuit
Beamline, RF Cavity, Quadrupole Magnets, Dipole Magnets, Particle Source, Particle Detector, Exposure Chamber, Solid State Quantum Processor
Artillery Turret "Greg", Rocket Artillery Turret "Henry"
Oil Derrick, Pumpjack
Coker Unit
The Gadget, Little Boy, Fat Man, Ivy Mike, Tsar Bomba, The Prototype, F.L.E.I.J.A., The Blue Rinse, N² Mine, Balefire Bomb, Custom Nuke, Nuclear Warhead, Thermonuclear Warhead, Size 10 Micro Nuclear Warhead, Size 10 Nuclear Warhead, Size 15 Nuclear Warhead, Size 15 N² Mine, Size 15 BF Warhead
Hydraulic Fracking Tower, Flare Stack, Catalytic Cracking Tower
MHD Turbine, Plasma Forge, Fusion Reactor Vessel, ICF Laser Cell, ICF Laser Flash Tube, ICF Laser Capacitor, ICF Laser Turbocharger, ICF Laser Casing, ICF Laser Port, ICF Laser Controller, ICF Stability Element, ICF Containment Vessel Wall, ICF Casing, Inertial Confinement Fusion Reactor Core Component, ICF Fuel Pellet Maker
Heavy Machine Gun Turret "Checkov's Gun", Chaingun Turret "Mister Friendly", Autocannon Turret "Jeremy", XVL1456 Prototype Turret "Tauon", Rocket Launcher Turret "Richard", Goalkeeper Twin Chaingun CIWS "Howard", High-Energy MASER Turret "Maxwell", Heavy Flamethrower "Fritz"
Fusion Reactor Vessel Core Component, Superconducting BSCCO Coils, Fusion Reactor Blanket, Fusion Reactor Piping, Watz Reaction Chamber, Watz Reactor Supercooler, Watz Reactor Stability Element
Atomic Clock
Catalytic Reformer, Hydrotreater, Pyrolysis Oven

These blueprints can be obtained by shredding numerous quantities of different materials in an annihilator; this will yield a blueprint based on the material used (for instance, 256 silicon wafers yield a microchip blueprint).

In addition, several circuits and upgrades are now made in the precision assembly machine, which has a chance of failing and returning a broken version; these broken versions can be recycled to regain a small amount of the materials used. These items are:

Precision Assembly Machine
Item	Success rate	Recycling recovery rate
Microchip	90%	90%
Versatile Integrated Circuit	75%	75%
Solid State Quantum Processor	90%	75%
Atomic Clock	50%	75%
Control Unit	75%	90%
Advanced Control Unit	50%	75%
Quantum Computer	75%	75%
Any tier 2 upgrade (excluding conveyor upgrades)	50%	75%
Any tier 3 upgrade (excluding conveyor upgrades)	25%	75%

In addition, all items made in the precision assembly machine (aside from blueprint booklets) now require tantalum capacitors.

Chemical Plant

If the enable528PressurizedRecipes config setting is enabled, various recipes now require pressurized fluids in order to function. These recipes are:

Chemical Plant
Output fluid	Pressurized fluid(s)
Polymer Bar	Petroleum Gas (1 PU)
Bakelite Bar	Aromatic Hydrocarbons (1 PU) Petroleum Gas (1 PU)
Rubber Bar	Unsaturated Hydrocarbons (2 PU)
Hard Plastic Bar	BTX (2 PU) Phosgene (2 PU)
PVC Bar	Unsaturated Hydrocarbons (2 PU) Chlorine Gas (2 PU)
Solid Fuel (Rocket Propellant)	Petroleum Gas (1 PU)
TNT	Aromatic Hydrocarbons (1 PU)
Bar of Composition C-4	Unsaturated Hydrocarbons (1 PU)

The config setting also alters the kevlar sheet recipe, requiring phosgene instead of chlorine gas.

Crafting

528 mode completely removes some crafting recipes, those being:

Anvil

528 mode removes the ability to recycle some items in the anvil, those being:

All non-ReaSim RBMK components
Research reactor

Trivia

The name is derived from when Bob (the developer), was playing Black Mesa and noticed the difficulty was unusually high, especially when other people did not note the same difficulty. He performed an integrity check on the game and discovered it was actually slightly corrupted and the game was bugged as a result. The corruption was in a single file and only had a size difference of 528 bytes from the normal one.