. %. The slot offers a generous top prize worth x your stake, and has. We provide free demo of All Star Knockout online slot machine. All Star Knockout is a 5 reel, 20 payline slot from Northern Lights Gaming with a win potential of up to times your stake. Released in March , All Star Knockout Slot is a joint effort from Yggdrasil and relative newcomer Northern Lights Gaming. Game Type. Honest Reviews are made by our experts. Try the free demo, and read our complete review about its features, max win, gameplay and so more! Description. Click to find out more! Play the Yggdrasil Gaming slot All Star Knockout Ultra Gamble in play for fun mode, read our review, leave a rating and discover the best deposit bonuses. Return to player. Discover the exciting All Star Knockout by Yggdrasil. Featuring spin until you lose 'Win Spins', keep on. ll▷ All Star Knockout Slot Review ✓ Northern Lights Gaming ✓ 96% RTP ✓ Low Volatility ✓ Get up to bonus spins. All Star Knockout is a retro-themed online slot from Northern Lights and Yggdrasil Gaming. Sit back and play the superbly retro themed knockout slot game that will leave you wishing for the stars. Knockout Bonus Features Play the All Star Knockout Ultra Gamble online slot, and at the start of your session, 12 stars will land at random across the Try All Star Knockout slot online for free in demo mode with no download or no registration required.