Tod Rla Walkthrough (POPULAR · COLLECTION)

However, we cannot guarantee R0 reaches exactly 10 from 5 with only doubles if skips occur.

0x20: ADD R0, R0 ; R0 = 10 (5+5) 0x21: HLT But that takes 2 cycles. Destiny event at cycle 4 (which never occurs if we halt early). However, the problem says 12 cycles allowed , not required. But wait – the puzzle's twist: . The environment expects exactly 12 cycles to elapse, and a validation routine runs at the end. If you halt early, it fails. tod rla walkthrough

Example: MOV R5, R0 sets R0 to R5. If it's skipped, R0 stays whatever it was – not good. But ADD R0, R0 twice in a row – if one is skipped, the other still doubles. However, we cannot guarantee R0 reaches exactly 10

So we must fill 12 cycles with operations that keep R0 = R3 at the cycle, despite random swaps or skips. Step 2.3 – Handling Destiny Swaps Destiny swaps exchange R2 and R3 every 4 cycles (if the random square condition is met). That means R3 might unexpectedly change. However, the problem says 12 cycles allowed , not required

0x20: MOV R3, R5 ; backup target 0x21: SUB R5, R0 ; R5 = difference (target - current) 0x22: JZ 0x28 ; if already equal, jump to idle loop 0x23: ADD R0, R4 ; increment R0 by 1 (R4 is 1) 0x24: JMP 0x21 ; loop back to recalc difference But jumps take cycles, and we must fill exactly to cycle 12.

Address | Instruction | Comment ------------------------------------------------ 0x20 | CMP R0, R3 ; compare current vs target 0x21 | JZ 0x2C ; if equal, skip to safety 0x22 | ADD R0, R4 ; else increment (R4=1) 0x23 | MOV R0, R2 ; temporary store in R2 0x24 | CMP R0, R3 ; check again 0x25 | JZ 0x2C 0x26 | ADD R0, R4 0x27 | MOV R0, R2 0x28 | CMP R0, R3 0x29 | JZ 0x2C 0x2A | ADD R0, R4 0x2B | MOV R0, R2 0x2C | NOP ; dummy (0x00 opcode) 0x2D | NOP 0x2E | NOP 0x2F | HLT ; cycle 12 ends here Wait – That’s 16 instructions? No – we count cycles. Each instruction takes 1 cycle. We need exactly 12 cycles from start to HLT. The above would run 0x20 to 0x2F = 16 cycles. So we trim NOPs and adjust.

Practice with random seeds by using a TOD-RLA emulator (available on GitHub as tod-rla-sim ). Try the “Double Destiny” variant next – where R0 must be twice R3 at halt. Good luck, and may the Turn of Destiny ever be in your favor.