Evil 30×30 Picross — The Hardest Picross Configuration on the Platform

Evil 30×30 Picross is the end of the progression. Nine hundred cells. Sixty lines. Primary hypothesis chains of thirty to forty-four steps. Level 2 hypotheses with chains of sixteen to twenty-six steps. Twenty-eight to forty primary cycles to reach a complete solution. A total analytical commitment of 25–60 hours across weeks of dedicated work. There is nothing harder in browser-based Picross.

What Evil 30×30 Demands

Evil 30×30 does not introduce any technique that hasn't appeared at smaller sizes. Everything required here — overlap analysis, arrangement enumeration, hypothesis testing, nested Level 2 hypotheses, two-level documentation, multi-session management — was built and refined across the progression from 5×5 to 25×25. What 30×30 Evil does is bring all of it simultaneously to its maximum expression, across the largest constraint network available.

Extended primary chains: Thirty to forty-four steps per cycle — the longest in the progression. Each step in a 60-line grid can update thirty perpendicular constraint states simultaneously, and the intermediate sub-deductions that compound within each step require their own documentation entries.

Nested Level 2 hypotheses: Many Evil 30×30 configurations require Level 2 hypothesis work within primary chains. Level 2 chains at 30×30 run sixteen to twenty-six steps — longer than the complete Expert cycles at 12×12 or 15×15. Level 2 documentation is as thorough as Level 1.

High cycle count: Twenty-eight to forty primary cycles, each generating two to six further direct deductions post-confirmation. The total documented steps across a complete Evil 30×30 solve routinely exceed five thousand entries.

The Evil 30×30 Solving Approach

Standard exhaustion: The same Expert-level process as at smaller Evil sizes. At 30×30, this phase resolves 850–875 cells and takes 180–280 minutes across one or two dedicated sessions. Document the resulting grid state as the project baseline — this is the reference state to which any failed cycle block can be restored.

Documentation system: The five-component digital architecture from Extreme 30×30 (grid state file, cycle log, arrangement record, hypothesis chain record, session log) plus a sixth component for Evil: a hypothesis-level index. This document records, for every primary cycle, the specific Level 1 step at which any Level 2 hypothesis was opened, the Level 2 result and the Level 1 continuation step that followed, and the state of the constraint network at the Level 1/Level 2 boundary. The hypothesis-level index is the tool that makes Level 2 unwinds reliable at this scale — without it, identifying which cells belong to Level 2 versus Level 1 in a chain of thirty or more steps becomes unreliable after the first few cycles.

Primary cycle execution: Assume the first valid arrangement for the selected line. Execute the Level 1 chain with full step documentation in the hypothesis chain record. When Level 2 is required, open it explicitly in the hypothesis-level index with the Level 1 entry step recorded precisely. Execute Level 2 fully in the chain record, marked clearly as Level 2 steps. Resolve Level 2. Record the resolution in the hypothesis-level index. Continue Level 1. Find the Level 1 result. Execute the appropriate unwind or confirmation. Update all documentation. Apply the post-cycle standard pass.

Session protocol: Begin every session with a six-point verification: grid state file matches physical or digital grid; cycle log count is consistent with grid state; arrangement record is current for all unresolved lines; hypothesis chain record is complete through the last completed cycle; session log records the session boundary clearly; hypothesis-level index is complete for all cycles involving Level 2 work. This six-point check takes 10–15 minutes but prevents the constraint-state drift that compounds over multiple sessions.

Error recovery: At this scale, recovering from a documentation error that propagated across several cycles is a substantial effort. The most reliable approach remains identifying the last verified-consistent session boundary and restoring from there. At 30×30 Evil, this may mean restoring a full session's worth of cycle work — typically 2–4 cycles and their cascades. Accept this cost rather than attempting to trace errors forward through thirty or more steps of subsequent chain documentation.

This Is the Ceiling

Evil 30×30 is the hardest Picross puzzle this platform — and the browser-based Picross format generally — can produce. The solver who completes it has demonstrated full mastery of the Picross technique toolkit and the project management disciplines that large-format Evil solving requires. The progression from 5×5 Easy to 30×30 Evil spans every possible dimension of Picross difficulty: grid size, clue density, cross-referencing depth, enumeration load, hypothesis complexity, and session management demands.

There is no next step in grid size. The only progression from here is toward greater speed, cleaner documentation, and more efficient hypothesis selection at the formats already completed.

→ 30×30 Extreme — the same grid with suppressed cascade and no nested hypotheses, the recommended preparation for 30×30 Evil

→ 25×25 Evil — the nested hypothesis technique at the next scale down, with shorter chains and fewer cycles

→ 30×30 Easy — the same grid, the same pixel art, the same reveal — without any of the above

Stuck? At Evil, the 30×30 Solver is most valuable as a session-start consistency check — comparing the solver's constraint state assessment at the start of each session against the documented grid state file identifies any documentation drift before the next cycle block begins.