OPS BRIEF · INITIAL ACCESS

Drill the Cortex-M architecture, one exploit at a time.

Cortex Infiltrator is a bite-sized microlearning app for ARM Cortex-M23 / Cortex-M33. Skill-tree progression, a step-through assembly simulator with a live register file, pipeline traces, hex-dump inspection, and tap-the-bit mask challenges. Written from ARM's reference manual + CMSIS — no marketing, no ads, no trackers.

◯ no password ◯ no trackers ◯ progress syncs across browsers

// WHAT YOU'LL TOUCH

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Constellation skill tree

Eleven sectors — Boot, Registers, ISA, Stack, Memory Map, NVIC, SysTick, Bit-band, DMA, Low-power — each with link-gated nodes. Completing a node unlocks its neighbors.

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Step-through assembly simulator

Real ARM Thumb-2 instructions traced one cycle at a time. Live 10-register file with PC/SP callouts, flash animations on every write, RAW-stall pipeline traces.

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Bit-tap decoders + mask challenges

Click individual bits to construct CONTROL, NVIC_ISER, SCB->SCR, MPU_RBAR masks. Instant diagnostics on wrong bits — red-solid for extras, red-dashed for missing.

// SECTORS · 11 TOTAL · CONTENT ROLLING

SEC-00 Orientation ██████░░░░░░░░░░░░

SEC-01 Boot Sequence ██████░░░░░░░░░░░░

SEC-02 Register File ██████░░░░░░░░░░░░

SEC-03 Thumb-2 ISA ██████░░░░░░░░░░░░

SEC-04 Stack & ABI ██████░░░░░░░░░░░░

SEC-05 Memory Map ██████░░░░░░░░░░░░

SEC-06 NVIC & Interrupts ██████░░░░░░░░░░░░

SEC-07 SysTick & Timing ██████░░░░░░░░░░░░

SEC-08 Bit-band Alias ██░░░░░░░░░░░░░░░░

SEC-09 DMA Controller ██░░░░░░░░░░░░░░░░

SEC-10 Low Power Modes ██░░░░░░░░░░░░░░░░

Eight sectors have live payloads right now; the remainder are in active development. New exploits, bit-tap missions, and simulator traces ship continuously.

// WHO IT'S FOR

Firmware engineers

Shipping on Cortex-M23 / M33 silicon and tired of re-reading 500 pages of ARM manuals to recall one register layout.

Embedded students

Learning Thumb-2, AAPCS, and the exception model by watching real instructions mutate a register file — not by reading prose.

Self-taught & hobbyists

Making the jump from Arduino to bare-metal, or reading disassembly for the first time and wanting to stop guessing what each opcode does.

// PROGRESSION LOOP

01
Pick a sector.

Map view shows 11 sectors as constellation nodes. Click a sector in the sidebar, double-click a pulsing accent node to open.
02
Run the exploit.

Each lesson walks six+ steps: briefing, intel, step-through simulator, pipeline trace, hex dump, bit-field decode, recall quiz, debrief with a C-code callout.
03
Clear every gate.

Pass the quiz ≥ 4/5 and stage the exact bit mask. BYTES are only credited when every interactive gate is cleared.
04
Chain sectors.

Completion unlocks downstream nodes. Streak, clearance tier, and trophies all auto-track. Sync is debounced to the server.

Ready?

One OAuth click. The skill tree unlocks immediately. Your first BYTES land within five minutes.

build · SvelteKit + Supabase · source in vildly/cortex-infiltrator