Lucky Drop

Cinevva's analyzer read this game's design doc and its source, then wrote the brief below. "Make your own" hands it to the game creator as your opening message, so you start from a real spec rather than a one-line idea.

Create a browser-based 3D arcade casino game titled “Lucky Drop,” using a Three.js-style rendered scene with a responsive HTML HUD overlaid on top. It is explicitly an arcade-credit game, not real-money gambling. Begin the player with 500 credits, a 
0 bet, zero streak, and two playable modes: Plinko and Slots.

Scene and presentation: Use a dark navy/near-black space-like environment with subtle fog, scattered small white star points, blue ambient lighting, glowing accents, and a large faint luminous ring beneath the machines. Place a tall Plinko board on the left and a purple neon slot cabinet on the right in the same 3D scene. Use a perspective camera that smoothly shifts and aims toward the selected machine: a tighter left-side view for Plinko and a tighter right-side view for Slots. Give the active machine a brighter translucent highlight and let the inactive one remain dimmer. Add gentle idle motion to the groups and lights. The visual style should be polished, glossy, neon arcade UI: deep blue panels, glowing pale-blue pegs, purple slot-machine trim, gold highlights, and rounded glass-like HUD controls.

Plinko machine: Build a tall rectangular board with dark blue backboard, side rails, a top “DROP / PLINKO” sign, and eight staggered rows of glowing spherical pegs. At the bottom, make nine bins separated by vertical dividers, with visible payout labels from left to right: 0.4x, 0.6x, 0.85x, 1.2x, 2.2x, 1.2x, 0.85x, 0.6x, 0.4x. The center bin is the best target and should be visually emphasized in gold. When the player drops a ball, charge the current bet, spawn a glowing ball at the top, and simulate gravity, horizontal velocity, wall bounces, and collisions against the pegs until it falls into a bin. Resolve the win as bet multiplied by the landed bin multiplier and the Lucky Charm multiplier; round to whole credits. A result larger than the bet increments the streak, otherwise reset it. Show the outcome in the HUD and a temporary toast. Multiple balls can be active at once when Turbo is used.

Slots machine: Build a large glossy purple/magenta cabinet with a gold “777 / SLOTS” title, a dark reel well, three reel windows, bright lavender frames, a red lever on the right, and a subtle translucent glass overlay. Each reel contains a vertical strip of symbol cards, but mask the artwork so the visible result is the clean front 3-by-3 area (three reels and three visible symbol rows); use higher-resolution card-like textures with symbol and label. Symbols are cherries, lemons, bells, diamonds, stars, and green 7s. Their three-of-a-kind base payouts are respectively 4x, 2x, 6x, 12x, 9x, and 18x the bet. Any two cherries in the first two positions pays 1.5x the bet as a consolation result. Otherwise there is no payout. On spin, charge the bet, animate the reels vertically with different speeds and staggered stopping times, mask the outside more strongly during motion, then stop each reel on the selected result and evaluate it. Show a brief light/flash response for spins and wins.

Slot odds: Select symbols with weighted randomness. Base weights are cherries 3.2, lemons 3.5, bells 1.9, diamonds 1.1, stars 1.5, and 7s 0.9. Occasionally rig a result toward a three-of-a-kind or two cherries: base rig chance is 10%, increased by 4.5 percentage points per Loaded Reels level, capped at 28%; when rigged, 68% of the time make three of one weighted symbol, otherwise make two cherries plus another weighted symbol. Loaded Reels also boosts rare symbols (7, diamond, star) by 22% per level and reduces lemon weight correspondingly. Keep the actual reel outcome and payout rules consistent with these odds.

Shared progression and upgrades: The Shop opens an upgrade panel over the game and lets the player spend credits on repeatable upgrades. Upgrade costs start at 140 for Ball Control, 180 for Loaded Reels, 220 for Lucky Charm, and 260 for VIP Table, increasing each level as base cost times (level + 1)^1.45. Ball Control increases Plinko center-directed bounce bias by 18% per level and gives the center bin an additional 8% payout factor per level. Loaded Reels improves rare-symbol odds as described. Lucky Charm multiplies all wins in both modes by 1.08 per level. VIP Table raises the maximum bet from 
00 by $80 per level. Reject purchases when the player lacks credits and show a “Not enough credits” toast.

HUD: Overlay a responsive, pointer-interactive interface. At the top show the title “LUCKY DROP,” the subtitle “Arcade credits only — no real money,” a gold Shop button, pills for Credits, Mode, and Streak, and a changing status message such as the initial “Drop balls, spin reels, then snowball your upgrades.” At the bottom show Plinko and Slots tabs, bet controls with minus and plus buttons, the current bet, a Max Bet button, the current maximum, a mode-specific primary action button (“Drop Ball • 
0” or “Spin Slots • 
0”), a Turbo button, and a red/pink “Bank Bonus” button. Display a mode-specific payout table: Plinko’s nine bin multipliers with the center row emphasized, or Slots’ payouts plus the Loaded Reels rare-odds note. Keep the HUD readable over the 3D scene with translucent dark blue backgrounds, white text, muted lavender secondary text, blue primary buttons, gold purchase/max-bet buttons, and pink/red cashout controls.

Interaction rules: Clicking the HUD tabs switches modes and moves the camera. Clicking/tapping the actual Plinko board or slot cabinet also switches to that mode. The primary action plays the selected game. Turbo cycles x1, x2, x3: in Plinko it drops up to that many balls immediately if credits permit; in Slots it queues staggered spins, one at a time. Bet changes in 
0 increments from 
0 up to the current max; Max Bet sets the maximum. Bank Bonus converts the current streak into immediate credits equal to streak × 15 × Lucky Charm multiplier, then clears the streak; if there is no streak, show “Build a streak first.” Prevent play when credits are below the bet and show “Need more credits.” Support keyboard controls: Space plays the current action, Q selects Plinko, E selects Slots, and [ / ] lower or raise the bet. Use smooth button feedback, hover cursor behavior over the 3D machines, and short toast notifications for purchases, wins, losses, and state changes.