MGS2 Master Collection 100% companion

A single-file companion page for 100%-ing Metal Gear Solid 2: Sons of Liberty
(Master Collection Version), plus an optional local helper for live Steam sync.

What's in it:
- Roadmap: the 5-pass plan plus a 48-step ordered walkthrough of the Tanker and
  Plant, with per-step sub-checklists for dog tags, achievements and items
- Achievements: all 51 with official Steam icons, missable/cumulative flags,
  filters, search and a full how-to for each
- Dog Tags: all 394 across 10 difficulty lists, with 81 conditional-spawn notes
- Area Maps: 10 guard-position maps rebuilt cell-by-cell from the community
  tracking spreadsheet, zoomable, with a label-size control
- Photos: 48 location screenshots pinned to the step where each thing is, with
  cross-source duplicates removed by perceptual hash
- Big Boss Run, Missables, VR/Extra Modes, Sources & Notes
- Steam sync: ticks what you already own from any public profile
- 10 dark colour themes, contrast-checked

The page is one self-contained HTML file with no build step or dependencies.

Compiled from community guides (Steam Community, Video Chums, u/Spikeyroxas,
Dayngl's Guides, TrueSteamAchievements) - see README for full credits.

LICENSE

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+MIT License
+
+Copyright (c) 2026 rain
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+--------------------------------------------------------------------------------
+This licence covers the CODE in this repository only (index.html, steam-sync.py,
+steam-proxy-worker.js). The guide content is compiled from community sources and
+the screenshots are hot-linked from their authors' sites — see the Licence
+section of README.md before reusing either.
+
+Metal Gear Solid 2: Sons of Liberty is (c) Konami. This is an unofficial,
+non-commercial fan project.