By duozhandian 
I understand you’re interested in “bonus buy” slots that are available in free-to-play or demo modes. Here’s what you need to know:
## What are Bonus Buy Slots?
These are online slots where you can pay a large upfront amount (often 50x-100x your bet) to instantly trigger the game’s bonus feature (free spins, bonus round, etc.) instead of waiting for it to land randomly.
## Free/Demo Versions
Many popular bonus buy slots have free demo versions where you can:
– Play with virtual credits
– Experience the bonus buy feature without real money
– Test different games risk-free
## Popular Bonus Buy Slots with Free Play
**Pragmatic Play** (most famous for bonus buys):
– Gates of Olympus
– Sweet Bonanza
– Sugar Rush
– The Dog House Megaways
**Other providers:**
– Reactoonz (Play’n GO)
– Bonanza (Big Time Gaming)
– Mental (NoLimit City)
## Where to Find Free Versions
1. **Casino review sites** – Many have embedded demos
2. **Game developer websites** – Some offer demos
3. **Social casino apps** – Use virtual currency
4. **YouTube** – Gameplay videos show mechanics
## Important Notes
– **No real money wins** in demo mode
– **Geographical restrictions** may apply
– **Features may be limited** in some demos
– **Always verify** you’re on a legitimate, secure site
## Responsible Gaming Reminder
If you transition to real money play:
– Bonus buys are high-volatility features
– You can lose money very quickly
– Set strict budgets and time limits
– Never chase losses
Would you like recommendations for specific sites where you can try these games in demo mode?