A massive stone statue dominates the Chamber, its eyes glowing with arithmetic runes. It will not yield to a sword. Only correct calculations can break the enchantment — and wrong answers deal damage.

🎯 Quest Objectives

Compute values using let, expr, and $(( ))
Assign arithmetic results to shell variables
Solve the statue’s puzzle correctly on the first attempt
Run ./statue to trigger and win the boss encounter
Collect the Chamber’s treasure and unlock the Rift path

�️ Quest Prerequisites

Armoury side-quest complete
Sword in inventory (from armoury ./sword)

⚡ Command Cheatsheet

Syntax	Example	Result
`let "var=expr"`	`let "x=3*4"`	`x=12`
`expr a op b`	`expr 10 - 3`	`7` (printed)
`$((expr))`	`echo $((2**8))`	`256`
`$((var++))`	`echo $((n++))`	value then increment

Arithmetic Operators

Operator	Meaning
`+`	Addition
`-`	Subtraction
`*`	Multiplication
`/`	Integer division
`%`	Modulo (remainder)
`**`	Exponentiation

🗺️ Walkthrough

Step 1 — Enter the Chamber and read the runes

ls -F
# runes  statue*  chest
cat runes

The runes pose a riddle: “To defeat me, compute the Vault Code: multiply the number of doors in the Cellar by the number of exits in the Entrance, then add 7.”

The numbers vary per game session. Example: 4 doors × 1 exit + 7 = 11.

Step 2 — Practice arithmetic first

# Method 1: let
let "vault_code = 4 * 1 + 7"
echo $vault_code     # 11

# Method 2: expr (each token must be a separate arg)
expr 4 \* 1 + 7     # 11  (escape * to avoid glob expansion)

# Method 3: arithmetic expansion (preferred modern style)
vault_code=$(( 4 * 1 + 7 ))
echo $vault_code     # 11

Recommendation: Use $(( )) — it is cleaner, handles operator precedence correctly, and does not require expr to be installed.

Step 3 — Compute your specific answer

Replace the example numbers with the values from YOUR runes:

# Template:
answer=$(( doors_in_cellar * exits_in_entrance + 7 ))
echo "My answer is: $answer"

Step 4 — Face the statue

./statue
# The statue asks: "What is the Vault Code?"
# Enter your answer: 11
# CRACK! The statue crumbles. Victory!

Wrong answers reduce your HP. Make sure your math is right before running ./statue.

Step 5 — Loot the chest

cat chest
# Stone Key fragment obtained.
inventory

The stone key fragment is part of the multi-piece key that opens the Rift.

💡 Arithmetic Gotchas

Problem	Cause	Fix
`expr 4 * 1` → error	`*` glob-expanded	Escape: `expr 4 \* 1`
`let "x=5/2"` → `2`	Integer division	Use `bc` for floats: `echo "5/2" \\| bc -l`
Variable not set	Missing `$`	Use `echo $var`, not `echo var`
Wrong answer, took damage	Calculation error	Recalculate carefully before `./statue`

✅ Validation

You computed the vault code using all three methods (let, expr, $(( )))
You solved the statue puzzle without taking damage
The stone key fragment is in your inventory
The Rift path is now unlocked (visible in map)

➡️ Next Steps

The stone key fragment is needed for the Rift — but you still need pieces from the other branches first.

Continue exploring:

Hidden Chapel — for the tome fragment
Vault — for the goblet solution
Scrap Heap — for the portal link
When all four branches complete → The Rift

📚 External Resources

Continue your terminal adventure with these resources:

Bashcrawl Web Demo — Play in your browser, no installation required
Bashcrawl on GitHub — Source code, setup, and open contributions
GNU Bash Manual — Arithmetic — Shell arithmetic for the brave adventurer
IT-Journey Bashcrawl Hub — Full quest series and walkthroughs
Bash Arithmetic Guide — Master the realm of numbers

Stone dust settles. The Chamber is yours. Arithmetic — the ultimate weapon. 🐉