https://github.com/iNovaDev87/MaxWalletTaxContract/blob/4dd2686f5c48d55b5126961a53d5225c8e982b5c/DEPLOYABLE.sol

#1

Description: Miscalculation of tax (L124).

Risk: High - Breaks the transfer function because amount + (amount * tax%) is transferred in total.

Recommendation: Change to amount * thetax() / 10000 .

#2

Description: SafeMath not needed.

Risk: Low - Since 0.8.0, Solidity checks for over/underflows.

Recommendation: Remove SafeMath.

#3

Description: Redundant code in _transfer() .

Risk: Low - Results in an increase of gas.

Recommendation: Refactor redundant code to minimize gas costs and readability.

#4

Description: Long revert error strings.

Risk: Low - Results in an increase of gas.

Recommendation: Revert with custom Error codes.

https://github.com/zaryab2000/decipher_EVM_Puzzles

Easy:

1. {"value":5,"data":"0x"}
2. {"value":0,"data":"0x010203040506070809"}
3. {"value":7,"data":"0x"}
4. {"value":10,"data":"0x"}
5. {"value":0,"data":"0x0102"}

Medium:

1. {"value":0,"data":"0x000000"}
2. {"value":5,"data":"0x0102030405"}
3. {"value":9,"data":"0x0102"}
4. {"value":3,"data":"0x"}
5. {"value":3,"data":"0x01020304"}

Hard:

1. {"value":6,"data":"0x60066000f3"}
2. {"value":2,"data":"0x01"}
3. {"value":0,"data":"0x6000600001600a6000f3",}
4. {"value":6,"data":"0x01020304050607"}
5. {"value":2,"data":"0x600060000160016000f3"}

https://github.com/fvictorio/evm-puzzles

1. {"value":8,"data":"0x"}
2. {"value":4,"data":"0x"}
3. {"value":0,"data":"0xffffffff"}
4. {"value":6,"data":"0x"}
5. {"value":16,"data":"0x"}
6. {"value":0, "data":"0x000000000000000000000000000000000000000000000000000000000000000A"}
7. {"value":0,"data":"0x60016000F3"}
8. {"value":0,"data":"0x60FD6000526001601ff3"}
9. {"value":2,"data":"0x01020304"}
10. {"value":15,"data":"0x010203"}

https://github.com/podoodoo/web3-learning-journal/blob/main/README.md