# IDO Rules

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**The BSCS IDO Rule System** is crafted to safeguard investors while optimizing their experience through three distinct rules:

**💎** [**Riskless**](https://docs.bscs.finance/defi-1/ido-rules/riskless) **IDO Rule:** Offers a simple, all-or-nothing refund mechanism for all participants.

**💎** [**Vanguard**](https://docs.bscs.finance/defi-1/ido-rules/vanguard) **IDO Rule:** Provides flexible refund options, including partial refunds, for strategic flexibility.

{% hint style="info" %}
We will apply the specific IDO rule depending on each IDO project status.

These rules leverage a unified [Tier System](https://docs.bscs.finance/defi-1/tier-system-and-allocation), where higher tiers (Unicorn and Decacorn) unlock extended refund windows and exclusive perks.
{% endhint %}

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