Our Methodology

How we review slots

Every slot review on newbuild.com follows a standardised testing methodology that ensures transparency and reproducibility.

Testing process

• Hands-on test: At least 500 spins in demo mode
• RTP verification: Cross-referencing stated RTP with manufacturer data and independent sources
• Feature test: Systematic testing of all bonus features
• Mobile test: Testing across various mobile devices

Rating criteria

• RTP & Maths: Payout rate, volatility, hit frequency
• Gameplay: Game mechanics, features, entertainment value
• Design: Graphics, sound, mobile optimisation
• Fairness: Certifications, licences, rule transparency

Data sources

• Official manufacturer data (RTP, volatility, max win)
• Our own hands-on testing in demo mode
• Certifications from independent testing labs (MGA, UKGC, GLI)

Independence

Our reviews are editorially independent. Affiliate partnerships do not influence our test results or ratings.

Last updated: February 2026