[Snack-Doku

A puzzle integrated with a vending machine where players fill a grid following Sudoku rules to unlock items like a donut, a can of soda, or snacks. Each of the four squares has a letter A-D and a number 1-4 that can only appear once in each grid, row, and column.

Verification: Human verified

Snack-Doku is a recurring vending-machine puzzle in Escape Academy 2: Back 2 School, where you solve a small Sudoku-style grid to work out the code for a specific item. Each of the four squares in the grid carries a letter A–D and a number 1–4, and both the letter and the number can only appear once in each grid, row, and column. Solving the grid gives you the two-character code you punch into the machine to dispense the item a quest requires.

How the Puzzle Works

The machine functions like a Sudoku: every square holds a letter (A–D) and a number (1–4), and no letter or number repeats within a grid, a row, or a column. Because each square pairs one letter with one number, you're deducing two values at once for the blanks — which is what makes it a step up from a standard number-only Sudoku [src-4b8b4c5daa]. Reviewers have noted this dual letter-and-number twist as a fun recurring element that keeps building out the world [src-4b8b4c5daa].

How to Complete

1. Start the quest that points you to a machine. Snack-Doku puzzles are tied to side quests; a student will ask you for a specific item (a can of soda, a snack, etc.).
2. Find the correct vending machine. The quest's target machine is in a specific campus location — see the location list below.
3. Read the grid. Each of the four squares has a letter A–D and a number 1–4. Both can only appear once in each grid, and once in each row and column.
4. Fill in the blanks by elimination. Look at what's already shown in a row or column and rule out the letters and numbers already used, then fill in the only remaining option for each blank square.
5. Read off the code for the item you need from the completed grid.
6. Enter a coin and the code to dispense the item, then take it back to the student who requested it.

A recorded playthrough shows the elimination process in action: when a square's row and column already account for A, B, and D, the missing letter must be C, and the missing number resolves the same way — yielding a code such as C3 [src-eca7cb7683].

Locations and Known Solutions

• Fizziness as Usual: Talk to the sleeping student outside your dorm room and to the left. Open the doors to the left to reach the vending machine, solve the grid, and the soda is on code A4 [src-0dc02cf791].
• Chipping In: Talk to the student just outside the chemistry lab in the science campus. Go back down the stairs and follow the path around the dumpster to the machine; the snacks are on code C3 [src-0dc02cf791].

Tips

• Work row-by-row and column-by-column. Because each square needs both a letter and a number, check both dimensions before committing to an answer — a letter may be forced even when the number isn't obvious yet, or vice versa [src-eca7cb7683].
• Write it down. The grids are small but easy to scramble in your head; jotting the grid out as you eliminate options keeps your deductions straight [src-eca7cb7683].
• Don't guess the pattern. One player assumed the codes simply ran in order, but the correct approach is to solve each grid by the once-per-grid/row/column rule rather than by expecting a sequence [src-eca7cb7683].
• Keep a coin handy. You'll need to put in a coin to actually dispense the item once you've entered the code [src-0dc02cf791].

Rewards

Completing Snack-Doku quests gets the requested item into the student's hands and completes the side quest. Side quest puzzles of this kind are completed for cash, so expect a payout for finishing them [src-4b8b4c5daa].

Details

type

vending machine puzzle

puzzle_mechanics

Each of the four squares has a letter A-D and a number 1-4. Both can only appear once in each grid, and once in each row and column.

locations_and_solutions

Can be found in locations such as near the doors to the left (Fizziness as Usual quest where soda is on code A4) and down the stairs around the dumpster near the chemistry lab (Chipping In quest where snacks are on code C3).

Sources

• Escape Academy 2: Back 2 School walkthrough - Full guide and puzzle ...
• Escape Academy 2: Back 2 School Review - Escape Rooms Ace It, Open World Flunks
• Escape Academy Chapter 2 The Computer Lab
• The Escape Academy | Episode 3 | Bust a Move