Developer 
Lines Mega Lucky Diamonds Hold And Win by 1spin4win is a jewel-themed slot built around 243 ways to win, medium volatility and an RTP of 97.1%. The design uses multicoloured gems and classic card-suit symbols, with a stake range from 0.01 to 50. Players can use the demo version to play for free and practice before playing for real money.
The main feature is the Coin Respin bonus. Landing 3 or more Coins triggers 3 respins, and each new Coin resets the respin counter while the collected symbols stay on the reels. According to the game details, a Mini Jackpot Coin reveals the x100 Minipot, while gathering all 15 Coins awards the x1,000 Megapot.
As a Hold and Win slot, the focus is on securing bonus symbols and extending the feature round rather than chasing frequent base-game hits. The game page notes that the bonus can end when the respins run out or when all Coins have been collected, making the paytable and rules screen useful for checking the exact feature conditions before a session.
