Play Demo
Piggy Bank is a single-payline slot from JDB Gaming, designed for mobile play in portrait orientation. It doesn’t look like much at first glance, and that first impression isn’t entirely wrong.
Designed around the Asian market’s preference for number-based payout formats, this demo plays completely differently from a standard reel slot. Wins are not calculated from matched symbols; they are calculated by concatenating the numbers that land on the payline into a single figure and multiplying by the bet. Land a 5 and a 0, and the result is 50x. Land a 10 and two 0s, and it’s 1000x. A blank position doesn’t interrupt the sequence; it’s simply ignored, so only the number-producing reels contribute to the final value. That rule is the entire logic of the game.
The game uses 3 main number reels and 1 Special Reel, all spinning on a single central payline. At the minimum bet of 1 credit, only Reels 1 and 2 are active alongside the Special Reel. Reel 3 unlocks at bets of 5 credits and above. The number values on each reel change with the bet level, so higher stakes directly unlock larger number segments and, therefore, bigger concatenated wins. At low bets, Reel 1 can show 10, 5, or 1; Reel 2 can show 5, 1, or 0. At 50 and 100 credit bets, Reel 2 and Reel 3 both gain “00” segments, which dramatically extend the concatenation potential and push the maximum win toward the game’s 13,000x upper limit.
The Special Reel spins simultaneously with the main reels on every spin. When a special symbol stops at the centre, it modifies the outcome. Three types of modifiers can appear. Multiplier symbols (2x, 5x, or 10x) apply directly to the total win; the 10x multiplier only becomes available at bet levels of 10 credits and above. The Respin symbol respins all active main reels once and adds the post-respin win to the pre-respin win; at a 1-credit bet, the respin only applies to Reels 1 and 2. The Piggy (or Bonus) symbol triggers the Bonus Game.
A random modifier that can fire during any spin in regular play. When it triggers, the game selects one or more of the active reels (including the Special Reel, if any) and re-spins any blank position to a valid number symbol. It effectively removes dead spins by converting blank stops into contributing numbers. It’s not guaranteed on every spin and cannot be activated by the player.
Triggered when the Piggy symbol lands on the Special Reel. The Bonus Game operates on a separate reel structure with up to 3 levels, each consisting of a Prize Reel and its own Special Reel, which spin concurrently. The number of levels available depends on the bet. Bet 1 accesses Level 1 only; bets of 5 and 10 access Levels 1 and 2; bets of 50 and 100 unlock all three levels.
Prize values on the bonus reels scale significantly with the bet level. At 1 credit, Level 1 prizes range from 5 to 100. At 100 credits, Level 1 prizes range from 1,000 to 100,000. The Special Reel within the bonus game works the same as in regular play. Multipliers apply to the bonus win, and landing another Piggy symbol on the Level 1 or Level 2 Special Reel advances the player to the next bonus level for a free spin. Level 3’s Special Reel only shows multipliers; no further advancement is possible from the top level.
Feature Buy is available at 50x the total bet and immediately enters the Bonus Game at Level 1. It can only be purchased during regular play.
Set your bet using the available credit levels (1, 5, 10, 50, or 100 credits per spin) and spin. All wins are determined by concatenating the numbers that stop at the centre payline across all active reels, then multiplying by the bet. Blank positions are ignored. The Total Bet formula is Denomination × Bet Multiplier × 1. Wins are awarded once per spin; the highest possible concatenation from the active reels determines the payout.
| Bet | Active Reels | Reel 1 | Reel 2 | Reel 3 | Special Reel |
|---|---|---|---|---|---|
| 1 | 1, 2 + Special | 10, 5, 1 | 5, 1, 0 | — | 2x, 5x, Respin, Piggy |
| 5 | 1, 2, 3 + Special | 10, 5, 1 | 5, 1, 0 | 5, 1, 0 | 2x, 5x, Respin, Piggy |
| 10 | 1, 2, 3 + Special | 10, 5, 1 | 5, 1, 0 | 5, 1, 0 | 2x, 5x, 10x, Respin, Piggy |
| 50 | 1, 2, 3 + Special | 10, 5, 1 | 10, 00, 5, 1, 0 | 5, 1, 0 | 2x, 5x, 10x, Respin, Red Piggy |
| 100 | 1, 2, 3 + Special | 10, 5, 1 | 10, 00, 5, 1, 0 | 10, 00, 5, 1, 0 | 2x, 5x, 10x, Respin, Red Piggy |
| Bet | Levels Available | Prize Range (credits) |
|---|---|---|
| 1 | Level 1 only | 5 – 100 |
| 5 | Levels 1–2 | 25 – 1,000 |
| 10 | Levels 1–2 | 50 – 2,000 |
| 50 | Levels 1–3 | 500 – 50,000 |
| 100 | Levels 1–3 | 1,000 – 100,000 |
The slot’s maximum win of 13,000x can only be approached at the highest bet levels where all three bonus game levels are accessible and multipliers are in play.
Piggy Bank is best understood as a product built for a specific market, not as a broadly accessible online slot. The number concatenation format is common in Asian casino gaming, and JDB has delivered a clean execution of it. The Las Vegas jazz soundtrack gives it some personality from the first spin, the portrait layout works well on mobile, and the multi-level bonus game has genuine depth once you understand it. The problem is that "once you understand it" does real work in that sentence. The relationship between bet levels, reel content, and bonus game access is non-obvious to players unfamiliar with this format, and the single payline structure can feel sparse and infrequent for anyone used to modern slot formats. A Feature Buy session at 50x returned just 25x here, a losing result on a game that already takes patience to get anything from in regular play.
The free play demo session confirmed what the format implies. Regular play is quiet. The single payline produces occasional small hits, a 5 here or a 50 there, but the gaps between them are wide, and the Lucky Win Feature doesn’t arrive often enough to paper over the dry spells. The Special Reel is where all the session interest lives, and it felt underrepresented in the time spent with the game. The 50x Feature Buy landed a 25x return, which neatly tells the story of the volatility range. It’s a game where the house structure is clearly evident.
Whether it clicks depends entirely on whether you’re drawn to the format. Players who enjoy the number-matching slot style common to JDB, Jili, and similar Asian-market developers will recognise the design language and probably appreciate the bonus-level depth. For everyone else, a few spins of the demo will quickly confirm this isn’t your game.
JDB Gaming is a Taiwan-based studio focused primarily on the Asian online gaming market, where this format originated. Piggy Bank sits alongside titles like Money Coming (Jili Games) in the number-based single-payline category, a niche with an established and loyal audience, even if it’s not well represented in the European market.