Space Quest 1 2.2 Playthrough Analysis

This chapter is a clean-room, static-data reconstruction of a maximum-score winning route for the local games/SQ1.22 evidence set. It uses the canonical resources, WORDS.TOK, OBJECT, the locally inferred interpreter behavior, and rendered visual and priority/control channels. It does not use an external walkthrough.

The reusable source of truth is sq1_22_success_path.json. Each selected point-scoring action is a score_action node, its state conjunction is a separate precondition node, and player movement, parser input, waiting, and automatic transitions are edges. The JSON contains all 45 selected awards and validates to 202 points.

Regenerate the graph with:

python3 -B tools/render_playthrough_graph.py \
  docs/src/games/sq1_22_success_path.json \
  --output docs/src/games/sq1_22_success_path.svg

Evidence and interpretation

The game uses interpreter 2.917. Its resources contain 101 present logics, 73 pictures, 238 views, and 50 sounds. Logic 104 sets the maximum score to 202. The route was reconstructed from full logic disassembly rather than only the enclosing condition ranges emitted by tools/logic_playthrough_index.py.

Coordinates below are AGI picture coordinates. “Width in a rectangle” means that the whole player width and baseline satisfy the logic predicate; “baseline in a rectangle” means the left-baseline predicate used by the logic.

Movement is not inferred from the visible picture alone. For every selected room, the visual and priority/control channels were rendered together. The player’s complete baseline footprint must remain on allowed priority values. The white/control-0 background and control-1 barriers reject ordinary movement; colored priority regions form floors, ramps, arch throats, door notches, and cave passages. Room logic can additionally change the horizon, fixed priority, ignore-block state, or effective control geometry. Consequently an instruction to use an “opening” below means the opening visible in the priority/control channel, not a straight line across scenery.

The result is precise about static predicates but remains pending dynamic confirmation. Random numbers cannot be predicted from static resources, so the graph contains save/restore retry loops. Directional key durations inside wide walkable regions are intentionally not invented.

Exact maximum-score route

Arcada: 0 to 36

1. After entering the name, dismiss the automatic alarm message in room 2 and enter room 1. Briefly leave through the right exit to room 2 and return through the left doorway; the first room-1 entry alone does not arm the scientist sequence. Wait for the scientist to enter and collapse, dismissing both messages. Stand by him at x 98..130, y 102..115 and type LOOK SCIENTIST. Dismiss the wound description, wait until v33=1, then acknowledge the warning and “astral body” messages. This awards 2.
2. Put the player width inside x 74..88 with baseline y 104..108 and type LOOK SCREEN. Answer ASTRAL BODY. Wait until v50=2 and f35 is set, then at y 104..114 type GET CARTRIDGE. This awards 5.
3. Leave by the right corridor opening (x > 134 while y < 110), cross room 2, and enter room 3 upper-left. The keycard side is disconnected: take the room-3 elevator down, cross room 3 lower-right and room 4 lower-left, take the room-4 elevator up, then leave room 4 left into room 3 upper-right. At x 117..159, y 57..79 type GET KEYCARD for 1.
4. Return through room 4 lower-right and room 2 lower-left to the doorway into rooms 5 and 6. At room-6 x 86..134, y 125..136 type PRESS OPEN BAY DOOR; wait for f30 and the 2-point award. Never issue the closing toggle, which removes those points.
5. Room 7 can arm the common alien encounter on entry (v67=1). Inspect that state immediately; if armed, retreat to room 6 and re-enter rather than crossing the exposed floor. On a safe entry (v67=0), use the priority channel to reach x 74..95, y 125..131 and type INSERT KEYCARD for 2. Approach the elevator until its door countdown reaches v30=1, cross the doorway to the right, then move up into room 9.
6. At the room-9 console press the left closet button for the gadget. Put the ego’s full width inside x 40..71, y 94..110 (left x 61 works for the seven-pixel ego) and type GET GADGET for 2. Press the right closet button for the suit; at x 68..100, y 94..110 type GET SUIT for 2.
7. At the room-9 airlock console type PRESS AIRLOCK BUTTON, plan to the open doorway on the live priority screen, then cross left into room 8 as a separate dynamic transition. Enter the room-8 console pocket x 109..125, y 139..147 and type PRESS PLATFORM BUTTON exactly once for 1. Dismiss the completed-platform message, re-plan on the final priority screen, and enter the pod at x 49..60, y 88..102 with ENTER SHIP.
8. In room 10 type, in order, CLOSE DOOR, FASTEN BELT, PRESS POWER, and PRESS AUTONAV. AutoNav awards 2. Type PULL THROTTLE.
9. Wait through room 8’s pod-exit cutscene and room 12. Room 12 awards 15 for escape, returns to the in-flight room 10, and eventually enters room 13. The first room-13 approach from room 10 awards no points; its 25-point branch is guarded by a later return from room 37. Continue through the room-30 landing animation into room 14.
10. In room 14 type GET SURVIVAL KIT for 2, then OPEN SURVIVAL KIT. The global inventory logic consumes the kit and carries dehydrated water (item 12) and the Xenon Army Knife (item 19). Type UNFASTEN BELT and LEAVE POD.

Checkpoint: 36.

Kerona: 36 to 110

1. In room 30, at x 32..102, y 108..144, type GET GLASS for 3. Use the upper/east control openings through rooms 18 and 19, go north to 16, then east to 17. Do not cut across control-0 terrain.
2. Cross the room-17 arch throat at x 76..98, y 56..60 for 2. Wait through room 32 into room 25. At x 55..84, y 144..153 type GET ROCK, then leave left to room 26.
3. At room-26 x 2..40, y 135..160 type PUT ROCK IN GEYSER for 4 and wait for the geometry change. Never take the rock in room 26; that branch subtracts 4.
4. Use the opened upper-left passage into room 27. Follow the upper priority channel around the acid until the baseline reaches y < 46; this awards 3. Continue left through the control opening into room 28.
5. At x < 70 with baseline y 125..155 type USE GLASS ON BEAM. Wait for f121 and 5 points. Return through 27 and 26 to room 29 using the newly opened passages. Accept the Keronian task and wait for the surface return.
6. Reach room 19. At x 37..64, y 56..64 type PUSH ROCK and wait for the boulder to hit the spider, awarding 5. Go east to 20, then use its lower/east control opening into room 24.
7. Keep at least 15 picture units from the live Orat and type THROW WATER AT ORAT. Wait for f75 and 5 points. At the remains, x 112..152, y 115..142, type GET ORAT PART for 2.
8. Return through rooms 20, 17, 32, 25, and 26 to room 29. Type DROP ORAT PART for 10. Wait for room 31.
9. At the console, x 75..98, y 114..127, type INSERT CARTRIDGE for 5. Wait and read the displayed shutdown code 6858. After f37 is set, type GET CARTRIDGE at x 67..98, y 114..137 for another 5.
10. Enter and start the skimmer. Wait through rooms 78 and 33. The later room-37 return into room 13 is where the deferred 25-point award occurs.

The alternative combined spider/Orat award shares f165 with the boulder award. It is not additional score.

Checkpoint: 110.

Ulence Flats: 110 to 153

1. First arrival in room 35 awards 25. Stay near the skimmer. Answer NO to the buyer’s first offer at v58=4. Wait for his return and answer YES only at v58=7; the final sale awards 5, money, and jetpack item 9.
2. In room 38, at x 86..114, y 108..119, type GET BUCKAZOIDS for five currency units. This changes money, not score.
3. Enter the bar. For each round type BUY BEER near the bartender, then DRINK BEER. Repeat exactly three times. Each beer costs 2; the third drink sets f181, reveals sector HH, and awards 5.
4. Save before gambling. The slot controller accepts wagers of 1, 2, or 3, subtracts the wager before random reel selection, and pays 0 on losses. Winning classes pay 20/40/60, 10/20/30, 5/10/15, 3/6/9, or 1/2/3 for wagers 1/2/3. Total money saturates at 250. Restore after an unacceptable loss or repeat while solvent until v124 >= 45.
5. In room 71, cross the flight-droid selector x 93..114, y 65..69, follow the salesman, and type BUY DROID. The full-price route costs 45 and awards 4.
6. Save again and use the same explicit slot retry loop until v124 >= 214. Go to room 37 and type BUY SHIP for 4. This route costs 214; do not select the mutually exclusive credit/coupon branch.
7. Climb the ladder centered at x 107..111, y 132..133, enter the ship, and LOAD DROID. Answer HH to the sector prompt and wait for flight.

Checkpoint: 153.

Deltaur: 153 to 202

1. Keep the jetpack on. In room 45, at x 70..89, y 101..106, type TURN HANDLE, fly through the opening, and wait for the room-61 maintenance cycle. The inner transition awards 1.
2. Reach room 57. Type OPEN TRUNK, then ENTER TRUNK; wait through the transport for 3. In room 53 exit, open the trunk, type PUT JETPACK IN TRUNK, close it, PUSH TRUNK, CLIMB TRUNK, and OPEN VENT with the knife.
3. With f82, v249=4, and outfit state v81=1, type ENTER VENT for 2. Never use the closed-vent branch, which subtracts 2. Traverse room 52’s priority channel and descend the laundry grate. Re-entry to room 53 awards 1.
4. Open the washing-machine door. At x 60..74, y 107..111 type ENTER WASHING MACHINE. Wait until v72=5 and v81=3; this awards 5. Type SEARCH BODY to obtain Sarien ID card item 13.
5. In a corridor other than room 50, wait until a roaming guard is within distance 30. Type TALK TO GUARD once for 1. Continue waiting and talking through random responses until the King’s Quest II question sets f218; answer YES on the next input cycle for 5. With a guard still close, type KISS GUARD for 1.
6. In room 51, stand at x 117..133, y 135..145. Wait until observer flag f38 is clear and type GET GRENADE for 1. Wait for the second available/unwatched state and repeat for another 1. Show/use the ID card at the service droid to receive the pulseray for 3.
7. Enter room 50, align with its guard at a safe distance, and press F6 until projectile object 11 comes within 20 units of guard object 10. The room-50 hit awards 5 and sets f171. Do not shoot a roaming corridor guard; its 3-point award is an excluded alternative.
8. At the body box x 70..86, y 145..164 type SEARCH BODY or GET REMOTE CONTROL for 3. Move away and type PRESS REMOTE BUTTON for 3, setting f215.
9. Enter room 65 through x 69..87, y 115..124. The keypad is operated by walking, not typing digits. Without touching another digit, walk onto: 6 at x 89..97/y 118..131; 8 at x 77..85/y 136..148; 5 at x 77..85/y 118..131; 8 again; then ENTER at x 65..97/y 80..90. Acceptance awards 10 and starts the destruction countdown.
10. Immediately retrace room 65 -> 50 -> 49 -> 54 -> 62 through the corridor priority bands. Room-62 first entry awards 1. At x 0..24, y 120..124 type ENTER SHIP; after f35, type PRESS LAUNCH for 3.
11. Wait through rooms 43, 63, and terminal room 64.

Final score: 202.

Timing, randomness, and failure branches

The JSON makes three retrying states explicit:

• the two money thresholds use save/slot/restore loops because static analysis determines the distribution and payouts but not the runtime seed;
• guard dialogue repeats after random non-question responses until f218;
• grenade theft waits for the observer’s phase to clear.

Other waits are deterministic state waits: the scientist sequence, bay and beam animations, landing, skimmer travel, trunk transport, laundry cycle, airlock, and shuttle launch. The self-destruct edge is a deadline: after the 6858 award, perform no optional actions.

Point-loss branches are deliberately excluded: kicking bodies, closing the bay, retracting the platform, taking the room-26 rock, entering a closed vent, and the alternative roaming-guard shot. Death/dead-end branches include acid, Orat contact, spider detection, slot bankruptcy, leaving the craft without the jetpack, armory detection, guard/guardian collision, and missing the shutdown deadline.

Score proof and remaining validation

The graph validator requires every score node to occur exactly once in score_route and requires its sum to equal logic 104’s maximum. Original- interpreter replay has now confirmed the route through room 30’s glass pickup at score 39. Later edges still require replay with room, score, inventory, and coordinate checkpoints. Where a corridor segment is wider than its static predicates require, replay uses the live priority channel rather than treating an invented key duration as evidence.