Answers with working code and formulas
Each page answers one real question people search for, with a snippet or formula you can use right away.
Loot drop rate calculator: what are the odds in N tries?Chance of at least one drop in N tries is 1 - (1 - p)^N. Free calculator, the formula for spreadsheets and Luau/GDScriptXP curve formulas: how much XP each level should needThree XP curve formulas game designers use (linear, power, exponential), what each feels like, a table for levels 1-50 aFree game sound effects you can use in a commercial gameWhat a licence must say before you ship free sound effects in a paid game (CC0 vs CC-BY vs non-commercial), plus a free Two free Godot 4 shaders you can paste in now: hit flash and dissolveWorking Godot 4 canvas_item shaders: a white hit flash driven by one uniform, and a noise dissolve with a glowing edge. A Roblox DataStore save script that never wipes player dataCopy-paste Luau for loading and saving player data with DataStoreService: retries, UpdateAsync, BindToClose and the guarRoblox DataStore limits: requests per minute, size per key, key namesThe DataStore limits from Roblox's docs: 60 + players × 40 reads and writes a minute, 4 MB per key, 50-character names, Roblox leaderboard script: leaderstats you can copy and pasteA working Luau leaderstats script for the player list leaderboard, with coins and level values that save, plus how to chRoblox global leaderboard: top players across every serverLuau for an all-time global leaderboard with OrderedDataStore: write scores, read the top 50, refresh within the requestRoblox daily rewards script with a login streakA server-side daily reward and streak script for Roblox: UTC day numbers, a streak that resets after a missed day, and rHow to make a codes system in Roblox (redeem codes)A server-side redeem-codes script: case-insensitive codes, expiry dates, one claim per player, and a RemoteFunction for How to use developer products in Roblox (ProcessReceipt that never double-grants)Sell coins and boosts with developer products: the ProcessReceipt pattern that records each PurchaseId so a purchase is How to make a Roblox game pass (and give the perk in a script)Create a pass in Creator Hub, then check ownership with UserOwnsGamePassAsync and grant passes bought mid-game with PromRoblox DevEx requirements: who can cash out Robux, and at what rateDevEx eligibility from Roblox's docs: 13+, 30,000 Earned Robux, verified email, DevEx portal account and tax form. RatesHow to make a shop GUI in Roblox that exploiters can't abuseBuild an in-game currency shop: the GUI sends only an item id, the server looks up the price, checks coins and grants thRoblox pet system: make pets follow the player smoothlyA client-side pet follow script with AlignPosition-free CFrame lerping, arc formation for several pets and a hover bob. Roblox egg hatching script: weighted random pets with real oddsServer-side egg hatching with weighted random rolls, shown odds that match the code, and a charge-once rule so a hatch iRoblox admin commands script with ranks (for your own game)Add :kick, :tp and :speed admin commands to your own Roblox game with TextChatService, a rank check by UserId and a servHow to raycast in Roblox: a gun script the server checksworkspace:Raycast with RaycastParams for a hitscan gun: the client sends aim, the server checks fire rate and origin, caRoblox round system: intermission, round timer and winnersA server loop for round-based games: wait for enough players, intermission countdown, teleport in, round timer, pick winHACCP plan template: the 7 principles with a worked exampleA HACCP plan in plain steps: hazard analysis, critical control points, critical limits, monitoring, corrective actions, Food temperature log: what to record and the limits to checkWhat a food temperature log needs (date, time, item, reading, initials, action) and the FDA Food Code limits: 41°F cold,Allergen chart template for menus: the 9 major US allergensAn allergen matrix lists every menu item against the 9 major US food allergens: milk, eggs, fish, shellfish, tree nuts, Cost per plate: work out food cost % and the right menu priceCost each plate from ingredient prices and portions, include yield loss, then price for a target food cost %. Formulas aProfit margin formula in Excel, after every feeMargin = (price - all costs) / price. Excel formulas for margin, markup, price for a target margin and real profit afterHow IFTA fuel tax is calculated, step by stepIFTA in four steps: fleet MPG, taxable gallons per jurisdiction, tax due at each rate, minus tax paid at the pump. A worMutual NDA template: what each part means and what to fill inA mutual NDA protects both sides' confidential information. The fields you fill in (parties, purpose, term, governing laA staff schedule in Google Sheets that adds up hours and labour costBuild a weekly staff rota in Google Sheets: shift start and end, unpaid breaks, overnight shifts, weekly hours per persoHow to create a debt payoff spreadsheet in Excel or Google SheetsBuild a debt payoff spreadsheet: one row per debt, NPER for months to payoff, a month-by-month schedule, and total interDebt avalanche vs snowball: which pays off faster, with an exampleAvalanche pays the highest rate first and saves the most interest; snowball pays the smallest balance first for quick wiMake a budget spreadsheet in Google Sheets (with the formulas)A zero-based budget in Google Sheets: a transactions tab, SUMIFS per category and month, plan vs actual, and a weekly 10A habit tracker in Google Sheets that counts your streakCheckbox habit tracker in Google Sheets: a checkbox per day, a running streak row, best streak and completion rate. WhatA workout log in Google Sheets that estimates your 1-rep maxLog sets in Google Sheets and let formulas do the coaching: Epley 1RM estimate, PR flags, weekly volume and a simple nexHow to plan a wedding in Excel or Google SheetsFour tabs plan a whole wedding: budget by category, guest list with RSVP counts, vendor contacts and payments, and a timHow to use CISA's Known Exploited Vulnerabilities (KEV) catalogDownload CISA KEV as JSON, filter it with jq (ransomware use, vendor, due date), match it to your CVEs, and rank the resHow do I find the HTS code for a product?Find a US HTS code step by step: chapter, heading, subheading, the 8-digit tariff line and 10-digit statistical suffix. A free email validation API you can call without a keyValidate email addresses with one GET: syntax, MX records, disposable and role addresses, typo suggestions (gmial.com), How to check what technology a website runs onFind a site's CMS, framework, analytics, CDN and email provider: response headers, page source, DNS records, and a free A free US ZIP code API (city, county, time zone, radius, distance)Look up any US ZIP: city, state, county FIPS, coordinates, time zone and Census demographics, plus radius search and disFree daily games like Wordle: one puzzle a day, same for everyoneDaily browser games in the Wordle spirit: one shared puzzle a day, a shareable result, no download. Logic, guessing and Free browser games with no download (phone or computer)Games that open in a browser tab and run on phones and computers: daily logic puzzles, party games for a group and quick