First-Buy Roadmap Optimizer

Ranked next-buy calculator for the DomBlox Roblox version of Needle In A Haystack. Inputs are current cash, valuables drop rate, sell price, and per-gamepass ownership. Outputs are recommended next buy, gold runway in mm:ss, expected payback hours, and a wasted-cash warning panel.

Current cash Straws per pull (current) Valuables drop rate (%) Avg sell price per straw Hands upgrade cost Legs upgrade cost Drone upgrade cost Vent distance (studs) Lobby size Session minutes

Gamepass ownership FAST LEGS (99 R$) 2x HANDS (249 R$) 2x CASH (249 R$) VENT IN YOUR POCKET (249 R$) +2 DRONES (199 R$) EVERYTHING bundle (649 R$)

Cash income / min0

Recommended next buy—

Gold runway—

Payback (hands T2)—

Straws/sec after queue0

P(find) this session0

Planning model from Tools Design.md — Tool 2 (First-Buy Roadmap Optimizer). Shop prices are not yet published by DomBlox; null inputs trigger the wiki-intent fallback. Last verified 2026-09-09.

Methodology and assumptions

Method: applies the F2.7 throughput ladder (hands T1..T5+, legs, drones) and the six gamepass multipliers from the F4.LT lookup table to a wallet-allocation model. Gold runway = (upgrade_cost - current_cash) / cash_income_per_min. Wasted-cash predicate fires when VENT IN YOUR POCKET is missing but drones are owned, when +2 DRONES runs solo, etc. Assumptions: peer-verified gamepass API does NOT list per-tier shop costs; calculator refuses to produce a hard recommendation when costs are null. Applicability: use to plan the first four hours of a session.

Sources

Tools Design.md — Tool 2 (First-Buy Roadmap Optimizer)
Roblox game-passes/v1 — universe 10761200080
Official Roblox Needle In A Haystack experience