By duozhandian 
I understand you’re asking about “bonus buy” features in online slots. This is a popular mechanic, but it’s important to approach it with caution and full awareness. Here’s a comprehensive breakdown.
### What is a “Bonus Buy”?
A **Bonus Buy** (also called Feature Buy or Buy-a-Bonus) is an option in many modern video slots that allows you to pay a **large multiplier of your bet** (e.g., 50x, 100x, 500x) to instantly trigger the game’s main bonus round or free spins, skipping the base game.
### Important Considerations & Warnings
1. **Extremely High Volatility & Risk:** You are paying a large sum upfront for a single, high-variance outcome. It’s possible to get less back than you paid, even in the bonus. **This is not a way to “secure” a win.**
2. **House Edge is Still Present:** The cost of the bonus buy is calculated by the game’s mathematical model (RTP) to give the casino its edge. You are not gaining a mathematical advantage.
3. **Can Be Very Expensive:** At high stakes, a single bonus buy can cost **hundreds or even thousands of dollars/euros**.
4. **Not Available Everywhere:** It’s banned in some jurisdictions (like the UK) due to concerns over problem gambling and the blurring of lines between slots and casino table games.
### Popular Slots Known for Bonus Buy Features
Here are some highly volatile slots where the bonus buy is a key part of the gameplay:
* **Pragmatic Play:** *Gates of Olympus, Sweet Bonanza, Sugar Rush, The Dog House Megaways, Big Bass Bonanza* series. (Costs often 100x-200x bet).
* **NoLimit City:** *Tombstone, Mental, San Quentin xWays.* (Known for very expensive but potentially massive bonus buys).
* **Play’n GO:** *Rise of Olympus, Legacy of Egypt.*
* **Hacksaw Gaming:** *Wanted Dead or a Wild, Chaos Crew.* (Often uses a “Bonus Bomb” feature).
* **Relax Gaming:** *Money Train* series, *Snake Arena.*
### How to Approach Bonus Buys Responsibly
If you choose to explore this feature, do so with a strategy:
1. **Understand the Game First:** Play the slot in the traditional way (with spins) to understand its mechanics, volatility, and bonus frequency **before** considering a buy.
2. **Know the Cost & RTP:** Check the paytable. The bonus buy screen should tell you the exact cost and the **specific RTP for the bonus round**, which is sometimes different from the base game RTP.
3. **Budget Strictly:** Consider your bonus buy budget as **entertainment money you are 100% prepared to lose**. Never chase losses with more bonus buys.
4. **Lower Your Stake:** If a 100x bonus buy at $1 per spin costs $100, consider lowering your base bet to $0.20. A $20 bonus buy is far less risky.
5. **It’s a Shortcut, Not a Strategy:** It’s designed for instant excitement, not long-term play. The house edge works faster this way.
### **Critical Final Advice**
* **Gambling is not a way to make money.** Bonus buys are a high-risk, high-cost feature that can deplete a bankroll very quickly.
* **Always prioritize responsible gambling.** Set deposit limits, loss limits, and time limits. Use the tools provided by licensed casinos.
* **If you feel you’re losing control,** seek help immediately from organizations like the National Council on Problem Gambling (1-800-522-4700 in the US) or GamCare (UK).
**In short: Bonus buys can be a thrilling part of modern slots, but they are a premium, high-risk feature. Always play within your means, understand the costs, and never view them as a profitable strategy.**