Yes! The Magic toolbelt booster stacks with ANY of the regular boosters. - For example, if you have the Magic toolbelt booster and a regular 2X SWIFT FIXER, you can stack the 2x SWIFT FIXER with the Magic toolbelt 2X SWIFT FIXER to become a 4X SWIFT FIXER.

For regular BOOSTERS, while you can use different boosters simultaneously, you cannot use two of the same BOOSTERS to increase the power ups.

For example, you can use a GREASE LIGHTNING 2X and a SWIFT FIXER 3X at the same time. However, you can't use a RAIN MAKER 4% and a RAIN MAKER 6% together. The second BOOSTER you apply will override the initial BOOSTER.