(This guide is currently incomplete, since I have not scanned all areas or finished all main-screen extra areas yet. This guide does have all locations for collectibles and weapon final forms (which are probably the most-sought-after items).)

The level locations are in an abbreviated form. A plus at the end indicates the second playthrough (“New Game Plus” or “NG+”).
After the game is completed initially, the main menu allow access to the extra areas: “Qwerty Zone” (area “Horizon Station”, indicated here as zone 9) and a second playthrough with some variation (“New Game Plus+”).
The level indications in this guide are in generally in the form z_l, where number before the underscore is the zone or “world” and the number after the underscore is the level in that zone.

guide updated: 2020 August 8
planned for future update: area scans (DOS###found variables)

Cally starts with a basic pistol and sword. All other weapons and weapon final forms have to be found.
(The scanner is in a weapon slot, but isn’t a real weapon. It can be purchased from Rupert’s shop once reaching Avalon, and has no upgrades.)
A weapon’s final form is not available until both the final form is found, and the weapon is leveled up past 24. (Weapons are capped at level 10 until completing the first playthrough.)

• original form: boomerang in 1_3; shotgun in 2_1; discgun in 2_11; blaster in 3_9; flamethrower in 4_2; sniper rifle in 5_2; bow in 6_5; assault rifle in 7_3; RPG in 8_3; scrap cannon in 9_2
  
• final form: pistol in 1_4+; shotgun in 2_8+; boomerang in 3_5+; flamethrower in 3_17+; bow in 5_1+; blaster in 5_16+; sniper rifle in 6_6+; scrapgun in 7_3+; RPG in bonus 1; discgun in bonus 2; assault rifle in bonus 3

The save file tracks the number of found items for each type of collectible; the “save file count” is the variable’s name.
The save file also tracks each specific instance of a collectible; these save file variables start with the “save instance file prefix” value, followed by an integer for most items or month abbreviation for the Aztec calendar pieces.
Collecting all library map pieces happens automatically while defeating the bosses in the first playthrough; getting all of them unlocks the eighth and final zone.
For each of the other collectibles, collecting all of a certain type opens a bonus area, which is accessible from the “roof” of Avalon in either playthrough. Each of these five bonus areas have a weapon final form or bonus item and multiple chests, have no enemies, and can be re-entered indefinitely.

• save file count: collectible_totalaztec
  
• save file instance prefix: collectible_aztec
  
• instance in level: Jan in 1_5; Feb in 3_9; Mar in 6_11; Apr in 8_13; May in hub 1+; Jun in 2_2+; Jul in 2_13+; Aug in 3_9+; Sep in 4_4+; Oct in 4_20+; Nov in 5_10+; Dec in 5_20+

• save file count: collectible_totallibrary
  
• save file instance prefix: collectible_mappiece
  
• instance in level: 1 (boss drops) in 1_boss; 2 (boss drops) in 2_boss; 3 (boss drops) in 3_boss; 4 (boss drops) in 4_boss; 5 (boss drops) in 5_boss; 6 (boss drops) in 6_boss; 7 (boss drops) in 7_boss

• save file count: collectible_totalamulet
  
• save file instance prefix: collectible_tawaret
  
• instance in level: 1 in 2_4; 2 in 4_6; 3 in 7_7; 4 in 1_3+; 5 in 2_9+; 6 (need bow final form) in 3_13+; 7 in 4_10+; 8 in 5_6+

• save file count: collectible_totalhiddenstaircase
  
• save file instance prefix: collectible_hiddenstaircase
  
• instance in level: 1 in 1_8; 2 in 2_10; 3 in 3_1; 4 in 4_11; 5 in 5_6; 6 in 6_3; 7 in 7_2; 8 in 8_5; 9 in 1_6+; 10 in 2_11+; 11 in 3_3+; 12 in 4_2+; 13 in 5_14+; 14 in 6_10+; 15 in 7_4+; 16 in 8_3+

• save file count: collectible_totalwhisperingstatue
  
• save file instance prefix: collectible_whisperingstatue
  
• instance in level: 1 in 2_13; 2 in 3_4; 3 in 3_19; 4 in 4_10; 5 in 5_13; 6 in 6_14; 7 in 7_18; 8 in 8_10; 9 in 1_9+; 10 in 2_5+; 11 in 3_20+; 12 in 4_15+; 13 in 5_17+; 14 in 6_6+; 15 in 7_14+; 16 in 8_10+

• save file count: collectible_totalhauntedbridge
  
• save file instance prefix: collectible_hauntedbridge
  
• instance in level: 1 in 5_3; 2 in 5_19; 3 in 7_13; 4 in 8_17; 5 in 1_7+; 6 in 2_15+; 7 in 3_6+; 8 in 3_16+; 9 in 4_6+; 10 in 4_17+; 11 (need bow final form) in 5_19+; 12 in 6_2+; 13 in 6_15+; 14 in 7_8+; 15 in 7_19+; 16 in 8_14+

There are eight different types of consumables Cally can collect or buy and then use at any time. Her backpack can originally only carry two items, but this can be upgraded to a maximum of eight slots. While all eight types of consumables can be purchased from Cally’s older sister, Robin, in Avalon, there is rarely need to do so. Consumables on each level can be collected a limitless number of times by simply leaving the level and returning.
This section shows which levels have each consumable. (It is possible that some locations were missed, but this list should contain the majority of consumable locations.)

• backpack code: 160
  
• occurrences: 3_12; 4_4; 4_6; 4_12; 4_20: × 2; 7_20; 8_10; 9_12; 1_3+; 4_3+; 4_17+; 5_8+

• backpack code: 161
  
• occurrences: 1_4; 1_8; 2_1; 2_3; 2_4; 3_5; 6_4; 6_13: × 1 (lower-left); 8_9

• backpack code: 162
  
• occurrences: 2_8; 5_2; 9_2; 1_8+; bonus 1: × 4

• backpack code: 163
  
• occurrences: 3_4; 8_10+; 8_17+

• backpack code: 164
  
• occurrences: 1_7; 5_1+

• backpack code: 165
  
• occurrences: 7_2; 5_11+: × 3; 5_17+

• backpack code: 166
  
• occurrences: 7_15+

• backpack code: 167
  
• occurrences: 2_10; 3_7; 4_9; 4_14: × 4; 6_16; 5_16+; 6_6+