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+# [01-GAS] Don not compare boolean expressions to boolean literals
+It is more cheaper to not compare boolean expressions to boolean literals
+
+QuestFactory:
+73: `rewardAllowlist[rewardTokenAddress_] == false`
+
+# [02-GAS] internal functions only called once can be inlined to save gas
+# [03-GAS] Setting the constructor to payable
+# [04-GAS] Using fixed bytes is cheaper than using string
+For large name is more cheap to use fixed bytes length instead of string.
+
+PoC
+input: Very large string wich has more than 32 bytes and is the name of your quest
+
+```
+contract Test {
+
+    mapping(string => uint256) test1;
+    mapping(bytes32 => uint256) test2;
+
+    function addInTest1(string calldata name) public {
+        test1[name] = 1;
+    }
+    function addInTest2(string calldata name) public {
+        test2[keccak256(abi.encode(name))] = 1;
+    }
+}
+```
+addInTest1: 52411 gas
+addInTest2: 32796 gas
+
+### Recommended Mitigation Steps
+Use bytes32 for `mapping(string => Quest) public quests;`
+
+# [05-GAS] Public Functions To External
+The following functions could be set external to save gas and improve code quality. External call cost is less expensive than of public functions.
+TODO: има още
+QuestFactory:
+61: `function createQuest(.....)`
+142: `function changeCreateQuestRole(address account_, bool canCreateQuest_)`
+159: `function setClaimSignerAddress(address claimSignerAddress_)`
+172: `function setRabbitHoleReceiptContract(address rabbitholeReceiptContract_)`
+179: `function setRewardAllowlistAddress(address rewardAddress_, bool allowed_) `
+219: `function mintReceipt(string memory questId_, bytes32 hash_, bytes memory signature_)`
+Erc20Quest:
+102: `withdrawFee()`
+RabbitHoleReceipt:
+65: `function setReceiptRenderer(address receiptRenderer_)`
+71: `function setRoyaltyRecipient(address royaltyRecipient_) `
+77: `function setQuestFactory(address questFactory_) `
+83: `setMinterAddress(address minterAddress_)`
+90: `function setRoyaltyFee(uint256 royaltyFee_)`
+RabbitHoleTickets:
+54: `setTicketRenderer(address ticketRenderer_) `
+60: ` setRoyaltyRecipient(address royaltyRecipient_)`
+# [06-GAS] Using unchecked blocks to save gas - Increments in for loop can be unchecked
+Quest:
+70: `for (uint i = 0; i < tokenIds_.length; i++)` 
+104: `for (uint i = 0; i < tokens.length; i++) {`
+RabbitHoleReceipt:
+117: `for (uint i = 0; i < msgSenderBalance; i++) {`
+121: `foundTokens++;`
+128 `for (uint i = 0; i < msgSenderBalance; i++)`
+131: `filterTokensIndexTracker++;`
+
+# [07-GAS] require() strings longer than 32 bytes cost extra gas
+RabbitHoleReceipt
+161: `require(_exists(tokenId_), 'ERC721URIStorage: URI query for nonexistent token');`
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